From d69f376bd51012df2b1c2a4fbc1d4bc56edc1afd Mon Sep 17 00:00:00 2001
From: Karl Berry <karl@freefriends.org>
Date: Fri, 22 Jan 2016 23:15:21 +0000
Subject: datetime2 (22jan16)

git-svn-id: svn://tug.org/texlive/trunk@39458 c570f23f-e606-0410-a88d-b1316a301751
---
 .../source/latex/datetime2/datetime2.dtx           | 4327 +++++++++++++++++++-
 1 file changed, 4159 insertions(+), 168 deletions(-)

(limited to 'Master/texmf-dist/source/latex/datetime2/datetime2.dtx')

diff --git a/Master/texmf-dist/source/latex/datetime2/datetime2.dtx b/Master/texmf-dist/source/latex/datetime2/datetime2.dtx
index 8e1bae7503a..af2c3e8fc7d 100644
--- a/Master/texmf-dist/source/latex/datetime2/datetime2.dtx
+++ b/Master/texmf-dist/source/latex/datetime2/datetime2.dtx
@@ -1,13 +1,13 @@
 %\iffalse
 % datetime2.dtx generated using makedtx version 1.1 (c) Nicola Talbot
 % Command line args:
-%   -doc "datetime2-manual.tex"
 %   -author "Nicola Talbot"
+%   -section "chapter"
 %   -src "datetime2.sty\Z=>datetime2.sty"
 %   -src "datetime2-calc.sty\Z=>datetime2-calc.sty"
-%   -section "chapter"
+%   -doc "datetime2-manual.tex"
 %   datetime2
-% Created on 2015/11/10 10:38
+% Created on 2016/1/22 15:29
 %\fi
 %\iffalse
 %<*package>
@@ -30,7 +30,7 @@
 %\fi
 % \iffalse
 % Doc-Source file to use with LaTeX2e
-% Copyright (C) 2015 Nicola Talbot, all rights reserved.
+% Copyright (C) 2016 Nicola Talbot, all rights reserved.
 % \fi
 % \iffalse
 %<*driver>
@@ -48,20 +48,42 @@
             pdftitle={datetime2: date and time formats}]{hyperref}
 
 
-\CheckSum{1991}
+\CheckSum{2343}
+\RecordChanges
+\DisableCrossrefs
 
 \renewcommand*{\usage}[1]{\hyperpage{#1}}
 \renewcommand*{\main}[1]{\hyperpage{#1}}
-\IndexPrologue{\chapter*{\indexname}\markboth{\indexname}{\indexname}}
+\IndexPrologue{\chapter*{\indexname}\markboth{\indexname}{\indexname}%
+\addcontentsline{toc}{chapter}{Index}}
 \setcounter{IndexColumns}{2}
 
-\newcommand{\style}[1]{\texttt{#1}\index{#1=\texttt{#1} style|main}}
+\newcommand{\style}[1]{\texttt{#1}%
+ \index{#1=\texttt{#1} style|main}%
+ \index{styles:>#1=\texttt{#1}|main}}
+
+\newcommand*{\module}[2][]{%
+ \ifblank{#1}%
+ {%
+   \href{http://ctan.org/pkg/datetime2-#2}{\texttt{#2}}%
+ }%
+ {%
+   \href{http://ctan.org/pkg/datetime2-#1}{\texttt{#2}}%
+ }%
+}
 
 \doxitem{Option}{option}{options (definitions)}
 
 \DTMsavetimestamp{gmt}{2015-03-01T15:35:09+00:00}
 \DTMsavetimestamp{bst}{2015-04-01T08:55:39+01:00}
 
+\newcommand*{\inpkg}[1]{\llap{\styfmt{#1}}}
+\newcommand*{\oldcs}[1]{\cs{#1}%
+ \index{datetime commands:=\styfmt{datetime} package commands>#1=\cs{#1}|main}%
+}
+
+\setlength\marginparwidth{70pt}
+
 \begin{document}
 \DocInput{datetime2.dtx}
 \end{document}
@@ -70,11 +92,11 @@
 %
 %\MakeShortVerb{"}
 %
-%\title{datetime2 v1.2:
+%\title{datetime2 v1.3:
 %date and time formats}
 %\author{Nicola L. C. Talbot\\\url{http://www.dickimaw-books.com/}}
 %
-%\date{2015-11-10}
+%\date{2016-01-22}
 %\maketitle
 %
 %\begin{abstract}
@@ -98,9 +120,9 @@
 %been a better name, but the 8 dot 3 filename restriction was a concern back
 %then.} However some users found the time formats useful
 %and the ability to save dates for later use, so when \sty{babel}
-%came along I~had a number of requests to make \sty{datetime}
+%came along I~had a number of requests to make \styfmt{datetime}
 %compatible with \sty{babel} so that the regional date formats were
-%preserved but the other \sty{datetime} functions could be used. 
+%preserved but the other \styfmt{datetime} functions could be used. 
 %Then PDF\TeX\ came into existence and its \cs{pdfcreationdate} now
 %provided a~way of obtaining the seconds and time zone, which can't
 %be obtained from \TeX's \cs{time} primitive.  Over time, the
@@ -108,7 +130,7 @@
 %original na\"ive \LaTeX\ code of my first package, as it's been
 %stretched well past its intended design.
 %
-%The other problem with \sty{datetime} is that some of the commands
+%The other problem with \styfmt{datetime} is that some of the commands
 %aren't expandable but some users want to be able to use them in
 %expandable contexts (such as, for example, PDF bookmarks or writing
 %a date stamp to an external file) or they
@@ -117,7 +139,7 @@
 %weekday and month names are proper nouns and so automatically start
 %with an upper case letter, regardless of where they appear in
 %a~sentence. Users who don't know the history and original purpose of
-%the \sty{datetime} package are puzzled as to why the defaults are
+%the \styfmt{datetime} package are puzzled as to why the defaults are
 %all UK English or some styles were hard-coded, and some users are
 %confused as to the ordering of the day, month and year parameters.
 %In addition, some command names were incompatible with other
@@ -125,7 +147,7 @@
 %compatibility with older documents.
 %
 %In order to address all these issues, a~replacement package is
-%necessary. Your old documents that use \sty{datetime} should
+%necessary. Your old documents that use \styfmt{datetime} should
 %still be able to compile, but for your new documents, you may prefer
 %the improved \styfmt{datetime2} package instead.
 %
@@ -273,7 +295,7 @@
 %options so \texttt{abbr} may not be available for some of them. The
 %\pkgopt{showdow} (show day of week) option is a package-wide option
 %even though it's a language setting. (This is because the
-%\sty{datetime2-calc} package is also needed if the day of the week
+%\styfmt{datetime2-calc} package is also needed if the day of the week
 %should be displayed. As a package option, \pkgopt{showdow} can
 %automatically load the required package.)
 %
@@ -283,6 +305,54 @@
 %the \pkgopt{showdow} setting as not all of them do.
 %\end{important}
 %
+%If for some reason you can't load \sty{babel} before \styfmt{datetime2}
+%and can only load it afterwards, then you need to explicitly load
+%the module for each \sty{babel} dialect with:
+%\begin{definition}[\DescribeMacro\DTMusemodule]
+%\cs{DTMusemodule}\meta{language}\marg{module-name}
+%\end{definition}
+%where \meta{language} is the language (or dialect) name used with
+%\sty{babel} (for example, \texttt{british}) and \meta{module-name} 
+%is the name of the \styfmt{datetime2} module (for example, \texttt{en-GB}).
+%
+%Example:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime2}
+%
+%\usepackage[british,irish]{babel}
+%
+%\DTMusemodule{british}{en-GB}
+%\DTMusemodule{irish}{ga-IE}
+%
+%\end{verbatim}
+%The \meta{language} argument should match the
+%\cs{date\meta{language}} command provided by \sty{babel}. Similarly
+%for \sty{polyglossia}:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime2}
+%
+%\usepackage{polyglossia}
+%\setmainlanguage[variant=uk]{english}
+%\setotherlanguage{irish}
+%
+%\DTMusemodule{english}{en-GB}
+%\DTMusemodule{irish}{ga-IE}
+%
+%\end{verbatim}
+%This ensures that not only is the required \styfmt{datetime2}
+%regional module loaded but also the date switching mechanism
+%\cs{date\meta{language}} is modified to prevent \sty{babel} or
+%\sty{polyglossia} from interfering with \styfmt{datetime2}.
+%
+%Remember that you need to switch on the regional style, if required:
+%\begin{verbatim}
+%\DTMsetup{useregional}
+%\end{verbatim}
+%
 %\chapter{Displaying the Date and Time}
 %\label{sec:display}
 %
@@ -301,11 +371,19 @@
 %(Some styles always ignore the day of week, regardless of its
 %value.) This command is intended for use in expandable contexts
 %(such as writing the date to another file or using the date in the
-%bookmarks) and is used by \cs{today}. The date styles should ensure
-%that any fragile content is protected. (This is why the \meta{dow}
+%bookmarks) and is used by \cs{today}. The date styles must ensure
+%that any fragile content is protected. (This is why \meta{dow}
 %isn't an optional argument otherwise the command wouldn't be
 %expandable.)
 %
+%\begin{important}
+%The \meta{dow} argument must always be an integer from $-1$ to $6$.
+%It should not be left blank or set to any other value. In some
+%cases using an incorrect value may not cause a problem, but in other
+%cases it will. So it's best to get into the habit of always setting
+%it correctly.
+%\end{important}
+%
 %Some styles may start the date with a word (such as the day of the
 %week name or the month name). In English, proper nouns are
 %capitalised regardless of where they appear in a~sentence but some
@@ -344,21 +422,21 @@
 %\end{important}
 %
 %As mentioned above, \emph{some styles} allow the day of the week to be
-%displayed. This requires the \sty{datetime2-calc} package which will
+%displayed. This requires the \styfmt{datetime2-calc} package which will
 %automatically be loaded if you set \pkgopt{showdow} in the
 %\styfmt{datetime2} package option list or if you set
 %\pkgopt{showdow} in \ics{DTMsetup} \emph{in the preamble}. The
-%package option \pkgopt{calc} will also load \sty{datetime2-calc} or
+%package option \pkgopt{calc} will also load \styfmt{datetime2-calc} or
 %you can load it explicitly using \cs{usepackage} after
 %\styfmt{datetime2} has been loaded. (You may use \pkgopt[true]{showdow} in
 %the \env{document} environment if the \styfmt{datetime2-calc}
 %package has been loaded in the preamble either explicitly or through
 %the \pkgopt{calc} option.)
 %
-%When \sty{datetime2-calc} is loaded, it computes the current day of
+%When \styfmt{datetime2-calc} is loaded, it computes the current day of
 %the week (using commands provided by the \sty{pgfcalendar} package)
 %which can then be used by \cs{today} or \cs{Today}. If 
-%\sty{datetime2-calc} isn't loaded then neither \cs{today} nor
+%\styfmt{datetime2-calc} isn't loaded then neither \cs{today} nor
 %\cs{Today} will display the day of the week, regardless of the
 %current style.
 %
@@ -388,13 +466,13 @@
 %\cs{DTMDate}. Use \cs{DTMdisplaydate} or 
 %\cs{DTMDisplaydate} instead.
 %\end{important}\footnotetext{Well, actually it can if you put it in braces
-%and don't use \sty{datetime2-calc}.}
+%and don't use \styfmt{datetime2-calc}.}
 %
 %These commands internally use \cs{DTMdisplaydate} and
-%\cs{DTMDisplaydate}, respectively. If the \sty{datetime2-calc}
+%\cs{DTMDisplaydate}, respectively. If the \styfmt{datetime2-calc}
 %package has been loaded, the day of the week will be computed,
 %otherwise the day of the week will be set to \texttt{-1}. Another
-%benefit of the \sty{datetime2-calc} package is that it allows
+%benefit of the \styfmt{datetime2-calc} package is that it allows
 %additional formats permitted by the \sty{pgfcalendar} package:
 %\begin{itemize}
 %\item \meta{YYYY}\texttt{-}\meta{MM}\texttt{-last} (the last day of
@@ -426,12 +504,12 @@
 %date.
 %
 %An error or unexpected results may occur if you try using one of
-%these extended formats without loading the \sty{datetime2-calc}
-%package. An example that only works with \sty{datetime2-calc}:
+%these extended formats without loading the \styfmt{datetime2-calc}
+%package. An example that only works with \styfmt{datetime2-calc}:
 %\begin{verbatim}
 %\DTMdate{2015-03-last}
 %\end{verbatim}
-%An example that works with or without \sty{datetime2-calc}:
+%An example that works with or without \styfmt{datetime2-calc}:
 %\begin{verbatim}
 %\DTMdate{2015-03-31}
 %\end{verbatim}
@@ -501,7 +579,7 @@
 %
 %The full date, time and zone (if available) can be displayed using
 %\begin{definition}[\DescribeMacro\DTMdisplay]
-%\cs{DTMdisplay}\marg{year}\marg{month}\marg{day}\marg{day of week}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
+%\cs{DTMdisplay}\marg{year}\marg{month}\marg{day}\marg{dow}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
 %\end{definition}
 %The arguments are all numerical.  The way the information is
 %displayed in the document is governed by the \termdef{full style}
@@ -515,7 +593,7 @@
 %
 %There is also an analogous version if capitalisation is required:
 %\begin{definition}[\DescribeMacro\DTMDisplay]
-%\cs{DTMDisplay}\marg{year}\marg{month}\marg{day}\marg{day of week}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
+%\cs{DTMDisplay}\marg{year}\marg{month}\marg{day}\marg{dow}\marg{hh}\marg{mm}\marg{ss}\marg{TZh}\marg{TZm}
 %\end{definition}
 %Some styles may simply make this equivalent to \cs{DTMdisplay}.
 %Other styles may use a~similar format to \cs{DTMdisplay} but replace
@@ -552,11 +630,11 @@
 %\end{definition}
 %where \meta{date} is in the same format as for \cs{DTMdate}.
 %As with \cs{DTMdate} (and \cs{DTMDate}) the format can be extended
-%with the \sty{datetime2-calc} package. If you want to access the day
-%of week, you must make sure that \sty{datetime2-calc} has been
+%with the \styfmt{datetime2-calc} package. If you want to access the day
+%of week, you must make sure that \styfmt{datetime2-calc} has been
 %loaded \emph{before you save the date}. (Remember that the \pkgopt{calc}
 %and \pkgopt{showdow} package options will automatically load
-%\sty{datetime2-calc}.) If \sty{datetime2-calc} has been loaded, the
+%\styfmt{datetime2-calc}.) If \styfmt{datetime2-calc} has been loaded, the
 %day of week number will be calculated and saved. Whether or not it
 %is displayed in the document when the date is later used depends on
 %the settings when the date is displayed not when it's saved.
@@ -574,7 +652,7 @@
 %\end{definition}
 %The day of week \meta{dow} may be \texttt{-1} if unknown. This
 %command doesn't calculate the day of week, even if
-%\sty{datetime2-calc} has been loaded.
+%\styfmt{datetime2-calc} has been loaded.
 %
 %Times are saved using
 %\begin{definition}[\DescribeMacro\DTMsavetime]
@@ -943,12 +1021,27 @@
 %The options that modify the
 %\style{default} style similarly modify this style.
 %
+%\item[\style{ddmmyy}] This is like the \style{default} style
+%except that the date is formatted in the reverse order
+%\begin{display}
+%\meta{DD}\meta{MDsep}\meta{MM}\meta{YMsep}\meta{YY}
+%\end{display}
+%The day, month and year are displayed as two-digits and the separators are
+%as for the \style{default} style. The options that modify the
+%\style{default} style similarly modify this style.
+%
 %\item[\style{mmddyyyy}] This is like the \style{ddmmyyyy} style
 %except the day and month numbers are reversed. The separator between
 %the month and day is still given by the \pkgopt{monthdaysep} or 
 %\pkgopt{datesep} options. The separator between the day and year is given by
 %the \pkgopt{dayyearsep} or \pkgopt{datesep} options.
 %
+%\item[\style{mmddyy}] This is like the \style{ddmmyy} style
+%except the day and month numbers are reversed. The separator between
+%the month and day is still given by the \pkgopt{monthdaysep} or 
+%\pkgopt{datesep} options. The separator between the day and year is given by
+%the \pkgopt{dayyearsep} or \pkgopt{datesep} options.
+%
 %\item[\style{mdyyyy}] This is like the \style{mmddyyyy} style except
 %that it doesn't force the day and month into a~two-digit format.
 %
@@ -992,7 +1085,7 @@
 %There's only one predefined time (partial) style provided
 %by the base \styfmt{datetime2} package. This style can be used to
 %override the time format part of full styles. For example, to use
-%the \style{default} full style with the \sty{hmmss} time style:
+%the \style{default} full style with the \style{hmmss} time style:
 %\begin{verbatim}
 %\DTMsetstyle{default}\DTMsettimestyle{hmmss}
 %\end{verbatim}
@@ -1239,7 +1332,7 @@
 %the zone mappings).
 %
 %The language modules may provide mappings that are enabled
-%when you switch to that style. For example, the \texttt{en-GB}
+%when you switch to that style. For example, the \module[english]{en-GB}
 %language module provides the \pkgopt{mapzone} option which, if set
 %to \texttt{true}, will map +00:00 to GMT and +01:00 to BST. See the
 %documentation for the language module for further details.
@@ -1356,12 +1449,13 @@
 %\begin{important}
 %Be careful not to mix the language\slash region options between the document
 %class option list and the \sty{babel}\slash\sty{polyglossia}
-%interface. For example:
+%interface. For example, don't do:
 %\begin{verbatim}
 %\documentclass[en-GB]{article}
 %\usepackage[canadien,british]{babel}
 %\end{verbatim} 
-%This will prevent the \sty{tracklang} package from picking up the
+%\end{important}
+%The above example will prevent the \sty{tracklang} package from picking up the
 %\sty{babel} setting and it will only detect the \texttt{en-GB}
 %option. Use only the document class options or only the \sty{babel}
 %package option list or duplicate \emph{all} the \sty{babel} package options with
@@ -1380,7 +1474,7 @@
 %\documentclass[fr-CA,en-GB]{article}
 %\usepackage[canadien,british]{babel}
 %\end{verbatim} 
-%\end{important}
+%
 %Language modules may be used without \sty{babel} or \sty{polyglossia}.
 %For example:
 %\begin{verbatim}
@@ -1391,7 +1485,8 @@
 %\end{document}
 %\end{verbatim} 
 %If you have more than one language or region you will need to switch
-%styles using \cs{DTMsetstyle} etc:
+%styles using \cs{DTMsetstyle} etc if you aren't using \sty{babel} or 
+%\sty{polyglossia}:
 %\begin{verbatim}
 %\documentclass{article}
 %\usepackage[en-GB,en-CA]{datetime2}
@@ -1513,7 +1608,7 @@
 %\end{verbatim}
 %In this case \sty{tracklang} is unable to pick up the variant and
 %can only detect the root language, so it will load the generic
-%\texttt{english} module instead of the \texttt{en-GB} module. This
+%\module{english} module instead of the \texttt{en-GB} module. This
 %means that the \style{en-GB} and \style{en-GB-numeric} styles are no longer
 %available. However, since \pkgopt{useregional} is \texttt{false} the
 %date is still displayed using the \texttt{default} numeric style
@@ -1566,7 +1661,7 @@
 %as \pkgopt{scottish}, provide a text style with the root language
 %name (\style{scottish} in this instance) and a numeric style in the
 %form \meta{language}\texttt{-numeric} (such as \style{scottish-numeric}).
-%Note that \texttt{irish} has regionless styles \texttt{irish} and
+%Note that the \module{irish} module has regionless styles \texttt{irish} and
 %\texttt{irish-numeric} but also has regional styles
 %\texttt{ga-IE} and \texttt{ga-IE-numeric} (for the Republic of
 %Ireland) and \texttt{ga-GB} and \texttt{ga-GB-numeric} (for Northern
@@ -1577,16 +1672,36 @@
 %\texttt{datetime2-irish}, \texttt{datetime2-ga-IE} and
 %\texttt{datetime2-ga-GB} is the time zone mappings.
 %
-%The language modules may provide additional settings that can be
+%The language or regional modules may provide additional settings that can be
 %applied using
 %\begin{definition}[\DescribeMacro\DTMlangsetup]
-%\cs{DTMlangsetup}\oarg{language list}\marg{options}
+%\cs{DTMlangsetup}\oarg{module-name list}\marg{options}
 %\end{definition}
-%where \meta{language list} is a comma-separated list of language
-%modules that have been loaded (such as \texttt{en-GB,en-US})
+%where \meta{module-name list} is a comma-separated list of 
+%modules that have previously been loaded (such as \texttt{en-GB,en-US})
 %and \meta{options} is a \meta{key}=\meta{value} list of options.
-%If \meta{language list} is omitted, then the list of all loaded
-%language modules is assumed. The modules may also provided 
+%
+%\begin{important}
+%Note that the names in the \meta{module-name list} are 
+%the identifying names of the module (such as \module[english]{en-GB} or 
+%\module{english})
+%which aren't necessarily the same as the language name supplied 
+%to whatever language package you are using (such as \sty{babel} or
+%\sty{polyglossia}). The code for each module should be in the file
+%\texttt{datetime2-\meta{module-name}.ldf}, which should be in TeX's
+%path.
+%\end{important}
+%
+%If \meta{module-name list} is omitted, then the list of all loaded
+%modules is assumed. There is also a starred version
+%of this command (as from v1.3) which suppresses the warning
+%if the given \meta{options} aren't available for any of
+%the modules named in \meta{module-name list}. You may prefer
+%to use the starred version if you omit \meta{module-name list}
+%to skip the warnings from the base modules that don't support the
+%given options.
+%
+%The modules may also provided 
 %user commands to further customise the style. These settings should
 %all be described in the module's documentation, which should be
 %accessible via \texttt{texdoc datetime2-\meta{language}} where
@@ -1619,14 +1734,58 @@
 %modifications. (Don't forget to provide a README file.)
 %
 %Each language module should be in a file named
-%\texttt{datetime2-\meta{lang}.ldf} where \meta{lang} is the language
-%name or \meta{language ISO code}\texttt{-}\meta{country ISO code}. (See the
+%\texttt{datetime2-\meta{lang}.ldf} where \meta{lang} is either the language
+%name or in the form \meta{language ISO code}\texttt{-}\meta{country ISO code}. (See the
 %\sty{tracklang} documentation for further details of the naming
 %scheme.)
 %
+%A regional module may load a base module for the same language using
+%\begin{definition}[\DescribeMacro\RequireDateTimeModule]
+%\cs{RequireDateTimeModule}\marg{name}
+%\end{definition}
+%This will input the file \texttt{datetime2-\meta{name}.ldf}. This command
+%should not be used outside the \styfmt{datetime2} language module files.
+%If you are creating a package that explicitly needs to load one of these files,
+%then you can use:
+%\begin{definition}[\DescribeMacro\DTMusemodule]
+%\cs{DTMusemodule}\marg{language}\marg{name}
+%\end{definition}
+%where \meta{language} is the \sty{babel} or \sty{polyglossia} language or
+%dialect name that identifies the relevant \cs{date\meta{language}}
+%macro (for example, \texttt{english}) and \meta{name} is the same as
+%above (for example, \texttt{en-GB}).
+%
+%Note that \cs{RequireDateTimeModule} (which is also internally used
+%by \cs{DTMusemodule}) stores a mapping from the language name
+%and the module name. You can determine what module was loaded
+%for a given dialect name using
+%\begin{definition}[\DescribeMacro\DTMdialecttomodulemap]
+%\cs{DTMdialecttomodulemap}\marg{dialect}
+%\end{definition}
+%This expands to the required module name or \cs{relax} if the 
+%given dialect name wasn't used to load a module.
+%For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[british]{datetime2}
+%
+%\begin{document}
+%
+%british map: \DTMdialecttomodulemap{british}.
+%english map: \DTMdialecttomodulemap{english}.
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%british map: en-GB.
+%english map: .
+%\end{quote}
+%In the above, the second instance expands to \cs{relax}.
+%
 %\begin{important}
 %If you want to provide a language module don't assume all users want
-%to use the same input encoding or \sty{babel} shortcuts as you. Use \LaTeX\
+%to use the same input encoding or \sty{babel} shorthands as you. Use \LaTeX\
 %commands for non-ASCII characters (and remember to use \cs{protect}
 %where necessary).
 %\end{important}
@@ -1654,7 +1813,159 @@
 %\end{verbatim}
 %
 %This helps provide fully expandable dates for Lua\LaTeX\ and
-%\XeLaTeX\ users. (See the Scottish or Irish modules.)
+%\XeLaTeX\ users. (See the Scottish or Irish modules for examples.)
+%
+%\chapter{Standalone Month or Weekday Names}
+%\label{sec:names}
+%
+%\begin{important}
+%If you want the month name or weekday name to appear in a section
+%or chapter heading, it's best to use the expandable commands
+%provided by the language modules rather than the robust commands
+%provided by \styfmt{datetime2-calc}. Remember that you can't use robust
+%commands in PDF bookmarks and such commands may prevent case-changing in 
+%headers for page styles that use \cs{MakeUppercase}.
+%\end{important}
+%
+%The language or regional modules described in 
+%\sectionref{sec:lang} typically provide an expandable command 
+%\begin{definition}
+%\cs{DTM\meta{root-language}monthname}\marg{n}
+%\end{definition}
+%which takes a numerical argument that indicates the month number.
+%This command is used in the date style which ensures that even if
+%the document language has switched but not the date style, then
+%the month name will be in the correct language for that style.
+%(Otherwise you could end up with a mix of style from one dialect
+%using names from another language, which was one of the problems
+%with the original \styfmt{datetime} package.)
+%
+%For example, if the \module{english} module is loaded (which is
+%automatically loaded by the English dialect modules, such as
+%\module[english]{en-GB}) then the command \cs{DTMenglishmonthname} is
+%defined. So if you're writing in English and you want to display
+%just the
+%month name, then you can do:
+%\begin{verbatim}
+%\DTMenglishmonthname{1}
+%\end{verbatim} 
+%Some language modules, where month names aren't automatically
+%capitalised, may additionally define a version that
+%has the first letter in upper case. For example, the \module{french}
+%module defines \cs{DTMfrenchMonthname} in addition to
+%\cs{DTMfrenchmonthname}.
+%
+%Some of the modules may have other alternatives. For example,
+%the \module{serbian} module provides Cyrillic
+%(\cs{DTMserbiancyrmonthname}) and Latin
+%(\cs{DTMserbianlatinmonthname})
+%month names. It also provides \cs{DTMserbianmonthname}, which
+%defaults to \cs{DTMserbiancyrmonthname} but can be redefined
+%using \cs{DTMlangsetup}.
+%
+%To find out the available commands for the module you are using,
+%see that module's documentation.
+%
+%If you are writing a document that uses multiple languages
+%and you simply want to display the month name in the currently
+%selected language, then you can use the robust command 
+%\begin{definition}
+%\ics{DTMmonthname}\marg{n}
+%\end{definition}
+%provided by the \styfmt{datetime2-calc} package,
+%described in \sectionref{sec:calc}. Remember that the
+%\styfmt{datetime2-calc} package also loads the \sty{pgfcalendar}
+%package, which provides the expandable command
+%\cs{pgfcalendarmonthname}. (The \sty{pgfcalendar} package provides
+%multilingual support via the \sty{translator} package.)
+%
+%Some of the language modules additionally provide a command
+%that displays the first letter in upper case. This isn't provided
+%for languages where the month name is always displayed with
+%a capital first letter, such as in English. For example,
+%the \module{serbian} module also defines
+%\cs{DTMserbiancyrMonthname} and \cs{DTMserbianlatinMonthname},
+%with \cs{DTMserbianMonthname} initially defined to use
+%the Cyrillic version.
+%
+%So, if you specifically want to display the Serbian Cyrillic 
+%month name with the first letter in upper case, you need to
+%make sure the \module{serbian} module is loaded
+%and then use the provided \cs{DTMserbiancyrMonthname} command.
+%
+%If you want the month name to vary according to the current language
+%setting in the document, you can use the robust command
+%\begin{definition}
+%\cs{DTMMonthname}\marg{n}
+%\end{definition}
+%provided by \styfmt{datetime2-calc}, which will first
+%attempt \cs{DTM\meta{language}Monthname} and then
+%\cs{DTM\meta{language}monthname} before falling back on the
+%\cs{pgfcalendarmonthname}, see \sectionref{sec:calc} for further
+%details.
+%
+%Some, but not all, language modules provide a command (or commands)
+%for month name abbreviations. It's up to the maintainer of the
+%module to add these if they currently aren't provided. You will
+%need to check the module documentation to find out if abbreviations
+%are supported. If they are supported, they should be in
+%the form
+%\begin{definition}
+%\cs{DTM\meta{root-language}shortmonthname}\marg{n}
+%\end{definition}
+%Again there may be variations, such as new and old styles or alternative
+%alphabets. For example, the \module{english} module
+%provides \cs{DTMenglishshortmonthname}.
+%
+%As with the full form, if you want to display the abbreviation
+%in a specific language (or variation), then use the command
+%provided by the relevant language module. If you want the
+%abbreviation to pick up the current language, then you can
+%use the robust command
+%\begin{definition}
+%\cs{DTMshortmonthname}\marg{n}
+%\end{definition}
+%provided by the \styfmt{datetime2-calc} package. This will fall back on
+%\cs{pgfcalendarmonthshortname} if
+%\cs{DTM\meta{language}shortmonthname} isn't defined. See
+%\sectionref{sec:calc} for further details.
+%
+%Modules may additionally provide a version of the abbreviated
+%form that starts with a capital letter. This should typically
+%be in the form
+%\begin{definition}
+%\cs{DTM\meta{root-language}shortMonthname}\marg{n}
+%\end{definition}
+%Check the module documentation to see if this is provided.
+%Again, the \styfmt{datetime2-calc} package provides a robust command
+%\begin{definition}
+%\cs{DTMshortMonthname}\marg{n}
+%\end{definition}
+%that attempts to determine the relevant
+%module command from the language name.
+%
+%Language modules may or may not provide a command that displays
+%the weekday name. As with the month name, there may or may not
+%be an abbreviated version or capital first letter version
+%or variations such as new\slash old styles.
+%Check the module documentation for further details. If
+%the module doesn't provide a weekday name macro, then the 
+%provided styles won't support the \pkgopt{showdow} option.
+%
+%\emph{If} the module provides weekday name support, then
+%the name will typically be provided by a macro in the form
+%\begin{definition}
+%\cs{DTM\meta{root-language}weekdayname}\marg{n}
+%\end{definition}
+%where \meta{n} is an integer from 0 (Monday) to 6 (Sunday).
+%For example, the \module{english} module provides
+%\cs{DTMenglishweekdayname}.
+%
+%Again, the \styfmt{datetime2-calc} package provides \emph{robust}
+%commands that attempt to find the relevant module-provided 
+%command based on the current language. If not found, 
+%the fallback commands are those provided by the \sty{pgfcalendar}
+%package. See \sectionref{sec:calc} for further details.
 %
 %\chapter{Package Options}
 %\label{sec:pkgopt}
@@ -1668,6 +1979,9 @@
 %\item[\pkgopt{yearmonthsep}] This sets the separator between the
 %year and month for the big-endian and little-endian styles.
 %Default: \texttt{-} (hyphen).
+%Note that if you want a space as a separator you need to use \cs{space}. 
+%If you simply use a space character (for example, \verb|yearmonthsep={ }|)
+%then the separator will be discarded. The same applies for the other separators described below.
 %
 %\item[\pkgopt{monthdaysep}] This sets the separator between the
 %month and day.
@@ -1828,18 +2142,18 @@
 %
 %This key isn't available in \cs{DTMsetup}. Use \cs{DTMsetstyle} instead.
 %
-%\item[\pkgopt{calc}] Load the \sty{datetime2-calc} package. This
+%\item[\pkgopt{calc}] Load the \styfmt{datetime2-calc} package. This
 %will allow the day of week to be computed and allow you to use the
 %\sty{pgfcalendar} offset style date formats in commands like
 %\cs{DTMdate} as well as defining the commands described in
 %\sectionref{sec:calc}. This option doesn't take a value. It can't be switched
 %off. This option can't be used in \cs{DTMsetkeys}. The default is to
-%not load \sty{datetime2-calc}.
+%not load \styfmt{datetime2-calc}.
 %
 %\item[\pkgopt{showdow}] This is a boolean key that determines
 %whether or not to show the day of week in styles that support this.
 %Note that \pkgopt[true]{showdow} will automatically load
-%\sty{datetime2-calc} so
+%\styfmt{datetime2-calc} so
 %\begin{verbatim}
 %\usepackage[showdow]{datetime2}
 %\end{verbatim}
@@ -1850,13 +2164,13 @@
 %
 %This option may be used in \cs{DTMsetup}, but if you attempt to
 %switch it on in the \env{document} environment you'll get an error
-%if the \sty{datetime2-calc} package hasn't been loaded.
+%if the \styfmt{datetime2-calc} package hasn't been loaded.
 %\textbf{Not all styles support this setting.}
 %Default: \texttt{false}. 
 %
 %This option is actually a language-dependent option and isn't used
 %by the base package, but it's implemented as a package option as the
-%\sty{datetime2-calc} package is also needed if the day of the week
+%\styfmt{datetime2-calc} package is also needed if the day of the week
 %should be displayed. As a package option, \pkgopt{showdow} can
 %automatically load the required package.
 %
@@ -1886,12 +2200,12 @@
 %The language modules may additionally provide options which can be
 %set using:
 %\begin{definition}[\DescribeMacro\DTMlangsetup]
-%\cs{DTMlangsetup}\oarg{module list}\marg{option list}
+%\cs{DTMlangsetup}\oarg{module-name list}\marg{option list}
 %\end{definition}
 %
 %This will set the \meta{option list} for each module listed in
-%\meta{module list}. Unknown options will generate a~warning rather
-%than an error message. The default value of \meta{module list} is
+%\meta{module-name list}. Unknown options will generate a~warning rather
+%than an error message. The default value of \meta{module-name list} is
 %the list of all loaded modules.
 %
 %Example:
@@ -1915,6 +2229,12 @@
 %\usepackage[british]{datetime2}
 %\DTMlangsetup[en-GB]{mapzone}
 %\end{verbatim}
+%Alternatively you can use the starred version:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[british]{datetime2}
+%\DTMlangsetup*{mapzone}
+%\end{verbatim}
 %
 %Note that some modules may have options with the same name as the
 %above listed package options, but the keys are defined in different
@@ -2013,7 +2333,7 @@
 %\chapter{The \styfmt{datetime2-calc} Package}
 %\label{sec:calc}
 %
-%The \sty{datetime2-calc} package can be loaded after \styfmt{datetime2} in the 
+%The \styfmt{datetime2-calc} package can be loaded after \styfmt{datetime2} in the 
 %usual way:
 %\begin{verbatim}
 %\usepackage{datetime2}
@@ -2030,9 +2350,9 @@
 %
 %This package loads the \sty{pgfcalendar} package which provides a
 %way of computing the day of week from a given date. Once
-%\sty{datetime2-calc} has been loaded, you can enable or disable the
+%\styfmt{datetime2-calc} has been loaded, you can enable or disable the
 %weekday in dates where the style supports this, but note that \emph{not
-%all styles support this}, even if the \sty{datetime2-calc} package
+%all styles support this}, even if the \styfmt{datetime2-calc} package
 %has been loaded.
 %
 %As with the commands in \sectionref{sec:store}, the commands
@@ -2045,7 +2365,7 @@
 %zero, except for the day of week element, which will be set to
 %\texttt{-1}.
 %
-%In addition to enabling the weekday calculations, the \sty{datetime2-calc} 
+%In addition to enabling the weekday calculations, the \styfmt{datetime2-calc} 
 %package also provides the following commands:
 %\begin{definition}[\DescribeMacro\DTMsavejulianday]
 %\cs{DTMsavejulianday}\marg{name}\marg{number}
@@ -2079,9 +2399,9 @@
 %This is like the previous command but converts the date obtained by
 %incrementing the saved date with \meta{offset}. The result is stored
 %in \meta{register}. This is equivalent to
-%\begin{display}\ttfamily
+%\begin{quote}\ttfamily
 %\cs{pgfcalendardatetojulian}\{\meta{y}-\meta{m}-\meta{d}+\meta{offset}\}\marg{register}
-%\end{display}
+%\end{quote}
 %where \meta{y}, \meta{m} and \meta{d} are the year, month and day
 %fetched from the saved date. A negative \meta{offset} indicates an earlier
 %date.
@@ -2103,7 +2423,7 @@
 %\cs{pgfcalendarifdate}. Note that the
 %\texttt{equals}, \texttt{at least}, \texttt{at most} and
 %\texttt{between} keywords available in \meta{test} need to be in the
-%format specified by the \sty{pgf} manual, but remember that you can
+%format specified by the \styfmt{pgf} manual, but remember that you can
 %use commands like \cs{DTMfetchyear}.
 %Example:
 %\begin{verbatim}
@@ -2147,13 +2467,7 @@
 %\DTMusedate{mydate2}.
 %\end{verbatim}
 %
-%The \sty{pgfcalendar} package also provides a variety of useful
-%date-related commands. See the documentation (part of the \sty{pgf}
-%manual) for further details. Note that the language modules don't
-%use \sty{pgfcalendar} month and weekday names as the
-%\sty{pgfcalendar} package isn't loaded by default.
-%
-%The \sty{datetime2-calc} package also provides commands that convert
+%The \styfmt{datetime2-calc} package also provides commands that convert
 %a datetime instance into Zulu\footnote{That's Zulu as in the NATO
 %alphabet representation of the letter Z.}\ time (UTC+00:00).
 %
@@ -2185,109 +2499,3052 @@
 %\end{verbatim}
 %The above produces (using the \style{default} format):
 %\DTMsetstyle{default}%
-%
+%\begin{quote}
 %\DTMsavetimestamp{mydate}{2014-05-01T03:55:00 -06:00}
 %Original date: \DTMuse{mydate}.
 %
 %\DTMtozulu{mydate}{mydate2}
 %UTC+00:00: \DTMuse{mydate2}.
+%\end{quote}
 %
-%\StopEventually{\PrintIndex}
+%The \sty{pgfcalendar} package also provides a variety of useful
+%date-related commands. See the documentation (part of the
+%\styfmt{pgf} manual) for further details. Note that the language
+%modules don't use \sty{pgfcalendar} month and weekday names as the
+%\sty{pgfcalendar} package isn't loaded by default and the styles
+%need to match the language with the syntax. However, since the
+%\styfmt{datetime2-calc} package automatically loads the
+%\sty{pgfcalendar} package, as from v1.3 the \styfmt{datetime2-calc}
+%provides robust month name and weekday name commands that may be
+%used outside of date styles, which fallback on the commands provided
+%by \sty{pgfcalendar}.
 %
+%\begin{important}
+%The following commands, which are all robust, should not be used in date 
+%styles, since each language style must use the name macro for that specific 
+%language to match the style. Make sure you have the relevant
+%language module installed and loaded to allow these commands to work
+%correctly. See also \sectionref{sec:names}. Remember that instead of
+%these robust commands, you can simply just use the commands provided
+%by the \sty{pgfcalendar} package. (See the \styfmt{pgf} manual for
+%further details.)
+%\end{important}
 %
-%\chapter{The Code}
-%\iffalse
-%    \begin{macrocode}
-%<*datetime2.sty>
-%    \end{macrocode}
-%\fi
-%\section{datetime2.sty code}
-%\changes{1.0}{2015-03-24}{Initial release}
-%    \begin{macrocode}
-\NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{datetime2}[2015/11/10 v1.2 (NLCT) date and time formats]
-%    \end{macrocode}
-% Use \sty{tracklang} to find out what languages have been loaded.
-%    \begin{macrocode}
-\RequirePackage{tracklang}
-%    \end{macrocode}
-% Also require \sty{etoolbox}.
-%    \begin{macrocode}
-\RequirePackage{etoolbox}
-%    \end{macrocode}
-% Need \sty{xkeyval} for \meta{key}=\meta{value} interface.
-%    \begin{macrocode}
-\RequirePackage{xkeyval}[2006/11/18]
-%    \end{macrocode}
+%\begin{definition}[\DescribeMacro\DTMmonthname]
+%\cs{DTMmonthname}\marg{n}
+%\end{definition}
+%This checks if \cs{DTM\meta{lang}monthname} exists where \meta{lang}
+%is given by \cs{languagename}. If so, that macro is used. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[english]{babel}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMmonthname{12}
+%\end{document}
+%\end{verbatim}
+%Here \cs{languagename} is \texttt{english}, so this
+%uses \cs{DTMenglishmonthname} which is defined by the
+%\module{english} module.
 %
-%\begin{macro}{\dtm@yearmonthsep}
-% Separator between year and month for numeric dates.
-%    \begin{macrocode}
-\newcommand*{\dtm@yearmonthsep}{-}
-%    \end{macrocode}
-%\end{macro}
+%If the test with \cs{languagename} didn't work, \cs{DTMmonthname}
+%then tries with \meta{lang} set to
+%\begin{verbatim}
+%\TrackedLanguageFromDialect{\languagename}
+%\end{verbatim}
+%(\cs{TrackedLanguageFromDialect} is provided by the \sty{tracklang}
+%package.) If \cs{DTM\meta{lang}monthname} exists, then this command is used. 
+%For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[british]{babel}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMmonthname{12}
+%\end{document}
+%\end{verbatim}
+%Here \cs{languagename} is \texttt{british}, so this again uses
+%\cs{DTMenglishmonthname} as the root language is obtained from the
+%dialect to language mapping.
 %
-%\begin{macro}{\dtm@monthdaysep}
-% Separator between month and day for numeric dates.
-%    \begin{macrocode}
-\newcommand*{\dtm@monthdaysep}{-}
-%    \end{macrocode}
-%\end{macro}
+%\begin{important}
+%Note that this won't work if you confuse \sty{tracklang} by using an 
+%alternative dialect name in the class option or by directly loading 
+%\sty{tracklang} with different dialect labels.
+%\end{important}
 %
-%\begin{macro}{\dtm@dayyearsep}
-% Separator between day and year for numeric middle-endian dates.
-%    \begin{macrocode}
-\newcommand*{\dtm@dayyearsep}{-}
-%    \end{macrocode}
-%\end{macro}
+%In the event that neither of those commands exist,
+%\cs{DTMmonthname} will fallback on \cs{pgfcalendarmonthname}
+%(provided by the \sty{pgfcalendar} package). This will also issue a
+%warning. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMmonthname{12}
+%\end{document}
+%\end{verbatim}
+%This produces the warning message:
+%\begin{verbatim}
+%Can't find underlying language macro for
+%\DTMmonthname (language: english); 
+%using pgfcalendar macro instead
+%\end{verbatim}
+%and uses \cs{pgfcalendarmonthname} instead of
+%\cs{DTMenglishmonthname} (which hasn't been defined because the
+%\module{english} module \emph{hasn't been loaded}).
 %
-%\begin{macro}{\dtm@hourminsep}
-% Separator between the hour and minute for times.
-%    \begin{macrocode}
-\newcommand*{\dtm@hourminsep}{:}
-%    \end{macrocode}
-%\end{macro}
+%You can switch off the warning by setting the \pkgopt{warn} option
+%to false or by redefining \cs{dtmnamewarning} to ignore its
+%argument.
 %
-%\begin{macro}{\dtm@minsecsep}
-% Separator between the minute and second for times.
-%    \begin{macrocode}
-\newcommand*{\dtm@minsecsep}{:}
-%    \end{macrocode}
-%\end{macro}
+%\begin{definition}[\DescribeMacro\DTMMonthname]
+%\cs{DTMMonthname}\marg{n}
+%\end{definition}
+%This checks if \cs{DTM\meta{lang}Monthname} exists. First where
+%\meta{lang} is given by \cs{languagename} and then where \meta{lang}
+%is given by
+%\begin{verbatim}
+%\TrackedLanguageFromDialect{\languagename}
+%\end{verbatim}
+%If neither of those values of \meta{lang} match a defined command,
+%\cs{DTMMonthname} then tests for non-case-changing versions
+%\cs{DTM\meta{lang}monthname}.
+%This is because not all language modules provide a macro for use at the
+%start of a sentence since some languages always start month names
+%with a capital letter. For example, the
+%\module{english} module provides \cs{DTMenglishmonthname} but
+%doesn't provide an upper case alternative, since English month names
+%always start with a capital. Therefore:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[english]{babel}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMMonthname{12}
+%\end{document}
+%\end{verbatim}
+%just uses \cs{DTMenglishmonthname}.
+%
+%As before, if the relevant command can't be detected for any case
+%of \meta{lang} for either \cs{DTM\meta{lang}Monthname} or
+%\cs{DTM\meta{lang}monthname} (for example, the required language module hasn't
+%been loaded) then \cs{DTMMonthname} will use
+%\cs{pgfcalendarmonthname} and attempt to convert the first letter to
+%upper case.
+%
+%Since some \emph{but not all} language modules also provide month
+%name abbreviations, the \styfmt{datetime2-calc} package also provides:
+%\begin{definition}[\DescribeMacro\DTMshortmonthname]
+%\cs{DTMshortmonthname}\marg{n}
+%\end{definition}
+%This behaves in a similar way to \cs{DTMmonthname} but tries to
+%determine if \cs{DTM\meta{lang}shortmonthname} exists (where
+%\meta{lang} is either \cs{languagename} or obtained from
+%\cs{languagename} using \sty{tracklang}'s dialect to language
+%mapping). If no command can be found, the fallback uses
+%\cs{pgfcalendarmonthshortname} provided by the \sty{pgfcalendar}
+%package. For example, if the language module hasn't been loaded or
+%if the language module doesn't provide an abbreviated version.
+%
+%Similarly there is a version for the start of a sentence for
+%languages that normally use lower case month names:
+%\begin{definition}[\DescribeMacro\DTMshortMonthname]
+%\cs{DTMshortMonthname}\marg{n}
+%\end{definition}
 %
-%\begin{macro}{\dtm@timezonesep}
-% Separator between the date and time.
-%    \begin{macrocode}
-\newcommand*{\dtm@datetimesep}{\space}%
-%    \end{macrocode}
-%\end{macro}
+%There are also analogous commands for the weekday names, where
+%\meta{n} is an integer from 0 (Monday) to 6 (Sunday).
 %
-%\begin{macro}{\dtm@timezonesep}
-% Separator between the time and time zone.
-%    \begin{macrocode}
-\newcommand*{\dtm@timezonesep}{}
-%    \end{macrocode}
-%\end{macro}
+%\begin{definition}[\DescribeMacro\DTMweekdayname]
+%\cs{DTMweekdayname}\marg{n}
+%\end{definition}
+%This checks if \cs{DTM\meta{lang}weekdayname} exists where
+%\meta{lang} is given by \cs{languagename}.
+%If it does, that macro is used. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[english]{babel}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMweekdayname{6}
+%\end{document}
+%\end{verbatim}
+%This uses \cs{DTMenglishweekdayname}, which is provided by the
+%\module{english} module.
 %
-%\begin{option}{datesep}
-% Set year/month and month/day separator.
-%    \begin{macrocode}
-\define@key{datetime2.sty}{datesep}{%
-  \renewcommand*{\dtm@yearmonthsep}{#1}%
-  \renewcommand*{\dtm@monthdaysep}{#1}%
-  \renewcommand*{\dtm@dayyearsep}{#1}%
-}
-%    \end{macrocode}
-%\end{option}
+%If \cs{DTM\meta{lang}weekdayname} doesn't exist with \meta{lang} set
+%to \cs{languagename}, \cs{DTMweekdayname} then tests with
+%\meta{lang} set to:
+%\begin{verbatim}
+%\TrackedLanguageFromDialect{\languagename}
+%\end{verbatim}
+%If the command \cs{DTM\meta{lang}weekdayname} exists in this case, that 
+%command is used.  For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[british]{babel}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMweekdayname{6}
+%\end{document}
+%\end{verbatim}
+%This uses \cs{DTMenglishweekdayname} as it can determine (through
+%\sty{tracklang}) that \texttt{british} has been defined as a dialect
+%of \texttt{english}.
 %
-%\begin{option}{yearmonthsep}
-% Set year/month separator.
-%    \begin{macrocode}
-\define@key{datetime2.sty}{yearmonthsep}{%
-  \renewcommand*{\dtm@yearmonthsep}{#1}%
-}
-%    \end{macrocode}
-%\end{option}
+%If this second test fails, then \cs{DTMweekdayname} will issue a
+%warning and fallback on \cs{pgfcalendarweekdayname}, provided by the
+%\sty{pgfcalendar} package. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[calc]{datetime2}
+%\begin{document}
+%\DTMweekdayname{6}
+%\end{document}
+%\end{verbatim}
+%This produces the warning message:
+%\begin{verbatim}
+%Can't find underlying language macro for
+%\DTMweekdayname (language: english);
+%using pgfcalendar macro instead
+%\end{verbatim}
+%As before, this warning is produced with \cs{dtmnamewarning}.
+%
+%The first letter upper case version is:
+%\begin{definition}[\DescribeMacro\DTMWeekdayname]
+%\cs{DTMWeekdayname}\marg{n}
+%\end{definition}
+%As with \cs{DTMMonthname}, if no upper case version can be found in
+%the relevant language module this will use the non-case-changing
+%version. The fallback \sty{pgfcalendar} macro is again
+%\cs{pgfcalendarweekdayname} with an attempt to convert the first
+%letter to upper case.
+%
+%Again, abbreviations may or may not be supported by language
+%modules. If they're not supported, the fallback is
+%\cs{pgfcalendarweekdayshortname}.
+%
+%\begin{definition}[\DescribeMacro\DTMshortweekdayname]
+%\cs{DTMshortweekdayname}\marg{n}
+%\end{definition}
+%which will attempt to use \cs{DTM\meta{lang}shortweekdayname} and
+%\begin{definition}[\DescribeMacro\DTMshortWeekdayname]
+%\cs{DTMshortWeekdayname}\marg{n}
+%\end{definition}
+%which will attempt to use \cs{DTM\meta{lang}shortWeekdayname} or
+%\cs{DTM\meta{lang}shortweekdayname}.
+%
+%For completeness, there's also a language-sensitive date ordinal command:
+%\begin{definition}[\DescribeMacro\DTMordinal]
+%\cs{DTMordinal}\marg{n}
+%\end{definition}
+%where \meta{n} is a number from 1 to 31. Again, this shouldn't be
+%used in date styles, but only if a standalone date ordinal is required.
+%For most languages, this only has a suffix for the first day of the
+%month (that is where \meta{n} is 1) or the suffix may simply be a
+%full stop (period). It should not be confused with \sty{fmtcount}'s
+%\cs{ordinalnum} command, which is for general ordinals rather than
+%date-specific ordinals.
+%
+%\chapter{Migrating from \styfmt{datetime}}
+%\label{sec:migrate}
+%
+%This section is for users who want to switch over from the old
+%\styfmt{datetime} package.
+%
+%Note that \styfmt{datetime2} is modularised for improved efficiency both in
+%terms of package overheads and spreading the maintenance load. This
+%means that you only need to install \styfmt{datetime2} if you only want
+%the base numeric styles, but it you want multilingual or regional
+%support, you need to additionally load the required language module
+%or modules.
+%
+%For example, consider the following document that uses
+%\styfmt{datetime}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french]{babel}
+%\usepackage{datetime}
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%This just needs to have the \styfmt{datetime} package installed, which
+%includes the necessary file \texttt{dt-french.def}.
+%
+%This example can be adjusted for \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french]{babel}
+%\usepackage[useregional]{datetime2}
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%This requires both \styfmt{datetime2} and the \module{french} module,
+%so you need to ensure that both have been installed.
+%
+%The above example also draws attention to another change from
+%\styfmt{datetime} and that concerns the default package behaviour.  The
+%\styfmt{datetime} package defaults to a British date style, unless
+%\sty{babel} has been loaded first, whereas the \styfmt{datetime2}
+%package defaults to an ISO numeric style, unless language or
+%regional settings are provided in the class option. As illustrated
+%in the above, you need the \pkgopt{useregional} option if you want
+%\cs{datefrench} (or equivalent) to switch the date style.
+%
+%\section{\styfmt{datetime} package options}
+%
+%The \styfmt{datetime} package provides the following options, which can
+%be emulated with \styfmt{datetime2} or through one of its dependent
+%modules or packages:
+%
+%\begin{description}
+%\item[\pkgoptfmt{long}] This option was designed for full British
+%dates, and is the default if \sty{babel} isn't loaded. Example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[long]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%Wednesday 20\textsuperscript{th} January, 2016.
+%
+%This can be achieved with \styfmt{datetime2} and the \module{english}
+%module as follows:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space}}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{short}] This option was designed for abbreviated
+%British dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[short]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form:
+%Wed 20\textsuperscript{th} Jan, 2016
+%
+%This can be achieved with \styfmt{datetime2} and the \module{english}
+%module as follows:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%\DTMlangsetup[en-GB]{abbr,ord=raise,monthyearsep={,\space}}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{iso}] This option was designed for
+%\meta{YYYY}-\meta{MM}-\meta{DD} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[iso]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 2016-01-20. This is default for
+%\styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%If you don't want the style to depend on the separator settings, you
+%can use the \style{iso} style:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[style=iso]{datetime2}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{yyyymmdd}] This option was designed for
+%\meta{YYYY}\slash\meta{MM}\slash\meta{DD} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[yyyymmdd]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 2016/01/20. This is very nearly
+%in the same form as the default \styfmt{datetime2} style. All that
+%needs changing are the separators between the year, month and day:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/]{datetime2}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{ddmmyyyy}] This option was designed for
+%\meta{DD}\slash\meta{MM}\slash\meta{YYYY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[ddmmyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 20/01/2016. This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=ddmmyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{dmyyyy}] This option was designed for
+%\meta{D}\slash\meta{M}\slash\meta{YYYY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[ddmmyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 20/1/2016.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=dmyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{ddmmyy}] This option was designed for
+%\meta{DD}\slash\meta{MM}\slash\meta{YY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[ddmmyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 20/01/16.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=ddmmyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{dmyy}] This option was designed for
+%\meta{D}\slash\meta{M}\slash\meta{YY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[dmyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 20/1/16.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=dmyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{text}] This option was designed for a full UK textual
+%date. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[text]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%Wednesday the Twentieth of January, Two Thousand and Sixteen
+%
+%This document can be changed to \styfmt{datetime2} through the
+%\sty{datetime2-en-fulltext} package, which needs to be installed
+%separately:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2-en-fulltext}
+%\DTMsetdatestyle{en-FullText}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{us}] This option was designed for the standard US
+%date. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[us]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%January 20, 2016
+%
+%This can be achieved with \styfmt{datetime2} and the \module{english}
+%module as follows:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-US]{datetime2}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{mmddyyyy}] This option was designed for
+%\meta{MM}\slash\meta{DD}\slash\meta{YYYY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[mmddyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 01/20/2016.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=mmddyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{mdyyyy}] This option was designed for
+%\meta{M}\slash\meta{D}\slash\meta{YYYY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[mmddyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 1/20/2016.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=mdyyyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{mmddyy}] This option was designed for
+%\meta{MM}\slash\meta{DD}\slash\meta{YY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[mmddyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 01/20/16.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=mmddyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{mdyy}] This option was designed for
+%\meta{M}\slash\meta{D}\slash\meta{YY} dates. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[mdyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 1/20/16.  This can be changed
+%to \styfmt{datetime2} with a couple of package options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[datesep=/,style=mdyy]{datetime}
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{raise}] This option was designed to make the ordinal
+%st,nd,rd,th appear as a subscript. It was originally just intended for British
+%dates. This is one of the default settings for \styfmt{datetime}. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[raise]{datetime}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%Wednesday 20\textsuperscript{th} January, 2016
+%
+%With \styfmt{datetime2}, this setting \emph{may} be provided by a language
+%module, where appropriate. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{level}] This option was designed to make the ordinal
+%st,nd,rd,th appear level with the rest of the text (to counteract
+%the previous option). For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[level]{datetime}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: Wednesday 20th January, 2016
+%
+%With \styfmt{datetime2} this setting may be provided by a language
+%module, where appropriate. This is, in fact, the default setting for
+%the \style{en-GB} style:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%but can be explicitly set using:
+%\begin{verbatim}
+%\DTMlangsetup[en-GB]{ord=level}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{dayofweek}] This option was designed to show the
+%weekday name for those styles that supported it. This is one of the
+%default \styfmt{datetime} settings. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[dayofweek]{datetime}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%Wednesday 20\textsuperscript{th} January, 2016
+%
+%With \styfmt{datetime2} this setting \emph{may} be provided by a language
+%module, where supported. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%Some language modules don't support this option (just as some
+%language settings with \styfmt{datetime} also don't support the
+%\pkgoptfmt{dayofweek} option.)
+%
+%\item[\pkgoptfmt{nodayofweek}] This option was designed to hide the
+%weekday name for those styles that supported it (to counteract the
+%previous option). For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[nodayofweek]{datetime}
+%
+%\begin{document}
+%\today
+%\end{document}
+%\end{verbatim}
+%This produces the date in the form: 
+%20\textsuperscript{th} January, 2016
+%
+%This setting is the default for \styfmt{datetime2}.
+%However, if it \pkgopt{showdow} has been switched on, it can later
+%be switched off using
+%\begin{verbatim}
+%\DTMsetup{showdow=false}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{hhmmss}] This option was designed for time formats in
+%the style \meta{HH}:\meta{MM}:\meta{SS}. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[hhmmss]{datetime}
+%
+%\begin{document}
+%\currenttime
+%\end{document}
+%\end{verbatim}
+%This produces the time in the form: 17:28:52.
+%
+%This is the default for \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2}
+%
+%\begin{document}
+%\DTMcurrenttime
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{24hr}] This option was designed for 24 hour time formats in
+%the style \meta{HH}:\meta{MM}. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[24hr]{datetime}
+%
+%\begin{document}
+%\currenttime
+%\end{document}
+%\end{verbatim}
+%This produces the time in the form: 17:28.
+%
+%This can be achieved using the default \styfmt{datetime2} time style
+%with the seconds suppressed:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[showseconds=false]{datetime2}
+%
+%\begin{document}
+%\DTMcurrenttime
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{12hr}] This option was designed for 12 hour time
+%formats with \qt{am} or \qt{pm} suffixes. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[12hr]{datetime}
+%
+%\begin{document}
+%\currenttime
+%\end{document}
+%\end{verbatim}
+%This produces the time in the form: 5:28pm.
+%
+%This can be achieved through a \styfmt{datetime2} language module that
+%supports this format. For example, the \module{english} module:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB]{datetime2}
+%
+%\begin{document}
+%\DTMcurrenttime
+%\end{document}
+%\end{verbatim}
+%
+%\item[\pkgoptfmt{oclock}] This option was designed for a UK-style full text
+%time. For example:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[oclock]{datetime}
+%
+%\begin{document}
+%\currenttime
+%\end{document}
+%\end{verbatim}
+%This produces the time in the form:
+%Twenty minutes past Six in the afternoon
+%
+%This can be changed to \styfmt{datetime2} through the
+%\sty{datetime2-en-fulltext} package, which needs to be installed
+%separately:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2-en-fulltext}
+%\DTMsettimestyle{en-FullText}
+%\begin{document}
+%\DTMcurrenttime
+%\end{document}
+%\end{verbatim}
+%
+%\end{description}
+%
+%The \styfmt{datetime} package option \pkgoptfmt{nodate} was provided
+%before multilingual support was added to allow \sty{babel} users to
+%use the time commands without causing a conflict with the date. Once
+%support for the \sty{babel} package was added, this option became
+%superfluous.
+%
+%\section{Time and Date Commands}
+%
+%\begin{definition}
+%\ics{today}
+%\end{definition}
+%This is a robust command in later versions of \styfmt{datetime}. In
+%earlier versions is was fragile and had to be protected when used in
+%moving arguments. With \styfmt{datetime2}, this command is designed to
+%be expandable and so therefore is not robust and shouldn't need
+%protecting. (The date styles should take care of any fragile
+%commands, such as \cs{textsuperscript}, where necessary.)
+%
+%The current time is displayed with \styfmt{datetime} using
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{currenttime}
+%\end{definition}
+%The \styfmt{datetime2} equivalent is:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMcurrenttime}
+%\end{definition}
+%Again, the command provided by \styfmt{datetime} is robust and the
+%equivalent command provided by \styfmt{datetime2} is designed to be
+%expandable.
+%
+%A specific date is display by \styfmt{datetime}'s 
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{formatdate}\marg{DD}\marg{MM}\marg{YYYY}
+%\end{definition}
+%command. The arguments are in little-endian (UK) order with the day,
+%month and year. With \styfmt{datetime2} you can use either:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMdisplay}\marg{YYYY}\marg{MM}\marg{DD}\marg{dow}
+%\end{definition}
+%(expandable) or
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMdate}\{\meta{YYYY}-\meta{MM}-\meta{DD}\}
+%\end{definition}
+%(robust) where \meta{YYYY} is the year, \meta{MM} is the month
+%number, \meta{DD} is the day of month number and \meta{dow} is the
+%day of week number (starting from 0 for Monday) or \texttt{-1} to
+%disregard it.
+%
+%A specific time is displayed by \styfmt{datetime}'s
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{formattime}\marg{hh}\marg{mm}\marg{ss}
+%\end{definition}
+%command, which has three arguments: the hour (24) the minutes past
+%the hour and the seconds past the minute. With \styfmt{datetime2} you
+%can use either:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMdisplaytime}\marg{hh}\marg{mm}\marg{ss}
+%\end{definition}
+%(expandable) or
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMtime}\{\meta{hh}:\meta{mm}:\meta{ss}\}
+%\end{definition}
+%(robust) where \meta{hh} is the hour, \meta{mm} is the minutes and
+%\meta{ss} is the seconds.
+%
+%The date separator used by the predefined \styfmt{datetime} styles is
+%given by
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{dateseparator}
+%\end{definition}
+%which needs to be redefined if
+%required. With \styfmt{datetime2}, the date separator for the base
+%numeric styles (except the fixed \style{iso} style) can be changed
+%through the \pkgopt{datesep} package option. For example:
+%\begin{verbatim}
+%\usepackage[datesep={.}]{datetime2}
+%\end{verbatim}
+%or
+%\begin{verbatim}
+%\DTMsetup{datesep={.}}
+%\end{verbatim}
+%Some of the language modules may also provide a similar option. For
+%example:
+%\begin{verbatim}
+%\usepackage[en-GB]{datetime2}
+%\DTMlangsetup[en-GB]{datesep={.}}
+%\end{verbatim}
+%
+%The time separator for \styfmt{datetime} is given by
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{timeseparator}
+%\end{definition}
+%With \styfmt{datetime2}, the time separator for the
+%basic numeric styles (not including the fixed \style{iso} style) can be
+%changed through the \pkgopt{timesep} package option. For example:
+%\begin{verbatim}
+%\usepackage[timesep={.}]{datetime2}
+%\end{verbatim}
+%or
+%\begin{verbatim}
+%\usepackage{datetime2}
+%\DTMsetup{timesep={.}}
+%\end{verbatim}
+%Some of the language modules may also provide a similar option. For
+%example:
+%\begin{verbatim}
+%\usepackage[en-GB]{datetime2}
+%\DTMlangsetup[en-GB]{timesep={.}}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{pdfdate}
+%\end{definition}
+%The \cs{pdfdate} command provided by \styfmt{datetime} for use within
+%\ics{pdfinfo} became redundant with the introduction of
+%\ics{pdfcreationdate} to PDF\TeX\ version 1.30.0.
+%
+%Old style (using \styfmt{datetime}):
+%\begin{verbatim}
+%\pdfinfo{
+%  /Author (Me)
+%  /Title (A Sample Document)
+%  /CreationDate (D:20040501215500)
+%  /ModDate (D:\pdfdate)
+%}
+%\end{verbatim}
+%New style (simply using PDF\TeX):
+%\begin{verbatim}
+%\pdfinfo{
+%  /Author (Me)
+%  /Title (A Sample Document)
+%  /CreationDate (D:20040501215500)
+%  /ModDate (\pdfcreationdate)
+%}
+%\end{verbatim}
+%Alternatively you can use the \style{pdf} style:
+%\begin{verbatim}
+%\DTMsetstyle{pdf}
+%\pdfinfo{
+%  /Author (Me)
+%  /Title (A Sample Document)
+%  /CreationDate (\DTMdisplay{2004}{05}{01}{-1}{21}{55}{00}{00}{00})
+%  /ModDate (\DTMnow)
+%}
+%\end{verbatim}
+%
+%The \styfmt{datetime} command to display the month name is
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{monthname}\oarg{n}
+%\end{definition}
+%which can't be expanded. With
+%\styfmt{datetime2}, the month name for a specific language can be
+%obtained from a command provided by the relevant module. For
+%example, the \module{english} module provides
+%\begin{definition}[\inpkg{datetime2-english}]
+%\ics{DTMenglishmonthname}\marg{n}
+%\end{definition}
+%which is expandable. These types of commands are designed for use
+%within language-dependent date styles. This ensures that the name
+%matches the style. (One of the failings of \styfmt{datetime} was that
+%the original date styles provided when the package was originally
+%only intended for British dates produced weird hybrid styles when
+%multilingual support was later added and styles such as \pkgoptfmt{long} 
+%were used with another language.) These types of commands provided
+%by the \styfmt{datetime2} language modules are analogous to the
+%\cs{monthname\meta{language}} commands provided by \styfmt{datetime}'s
+%supporting language files (for example, 
+%\begin{definition}[\inpkg{datetime-defaults}]
+%\oldcs{monthnameenglish}\oarg{n}
+%\end{definition}
+%in \styfmt{datetime-defaults} or 
+%\begin{definition}[\inpkg{dt-french.def}]
+%\oldcs{monthnamefrench}\oarg{n}
+%\end{definition}
+%defined in \styfmt{dt-french.def}) except that the \styfmt{datetime} commands have
+%an optional argument which means they're not expandable.
+%
+%If you load the \styfmt{datetime2-calc} package,
+%either explicitly or through the \pkgopt{calc} or \pkgopt{showdow}
+%\styfmt{datetime2} package options, then \sty{pgfcalendar} will also be
+%loaded. In which case you can use
+%\begin{definition}[\inpkg{pgfcalendar}]
+%\ics{pgfcalendarmonthname}\marg{n}
+%\end{definition}
+%even if none of the \styfmt{datetime2} language modules have been
+%loaded. This command requires the \sty{translator} package to
+%provide multilingual support. See the \styfmt{pgf} manual for further
+%details.
+%
+%Another possibility if you want the month name alone using the
+%current language is to use the robust command
+%\begin{definition}[\inpkg{datetime2-calc}]
+%\ics{DTMmonthname}\marg{n}
+%\end{definition}
+%defined by \styfmt{datetime2-calc}. This is the closest match to
+%\styfmt{datetime}'s \oldcs{monthname} command but note that the argument
+%isn't optional. Remember that you can use \ics{month} for the current
+%month number, which is the value of \meta{n} when omitted in
+%\oldcs{monthname}.
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\monthname
+%
+%\selectlanguage{english}
+%\monthname
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2} with the \module{french} and
+%\module{english} modules):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage[calc]{datetime2}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\DTMmonthname{\month}
+%
+%\selectlanguage{english}
+%\DTMmonthname{\month}
+%\end{document}
+%\end{verbatim}
+%
+%The abbreviated month name is given by 
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{shortmonthname}\oarg{n} 
+%\end{definition}
+%in
+%\styfmt{datetime}. Similar to above, language modules may provide an
+%expandable command to produce the abbreviated name in that specific
+%language. For example, the \module{english} module provides
+%\begin{definition}[\inpkg{datetime2-english}]
+%\ics{DTMenglishshortmonthname}\marg{n}
+%\end{definition}
+%As with \cs{DTMenglishmonthname}, this is designed for use in
+%English date styles.
+%
+%Again, if \styfmt{datetime2-calc} is loaded, the \sty{pgfcalendar}
+%command is also available:
+%\begin{definition}[\inpkg{pgfcalendar}]
+%\ics{pgfcalendarmonthshortname}\marg{n}
+%\end{definition}
+%Alternative you can use the robust command defined by
+%\styfmt{datetime2-calc}:
+%\begin{definition}[\inpkg{datetime2-calc}]
+%\ics{DTMshortmonthname}\marg{n}
+%\end{definition}
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\shortmonthname
+%
+%\selectlanguage{english}
+%\shortmonthname
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2} with the \module{french} and
+%\module{english} modules):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage[calc]{datetime2}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\DTMshortmonthname{\month}
+%
+%\selectlanguage{english}
+%\DTMshortmonthname{\month}
+%\end{document}
+%\end{verbatim}
+%
+%See \sectionref{sec:calc} and \sectionref{sec:names} for further
+%details.
+%
+%The weekday names in \styfmt{datetime} are more complicated 
+%and not all the \texttt{dt-\meta{lang}.def} files provide translations.  The ones
+%that do support the weekday provide 
+%\begin{definition}[\inpkg{dt-\meta{lang}.def}]
+%\oldcs{dayofweeknameid\meta{lang}}\marg{n}
+%\end{definition}
+%which takes a single argument that's an integer from 1 (Sunday) to 7 (Saturday).
+%For example, 
+%\begin{definition}[\inpkg{datetime-defaults}]
+%\oldcs{dayofweeknameidenglish}\marg{n}
+%\end{definition}
+%or
+%\begin{definition}[\inpkg{dt-french.def}]
+%\oldcs{dayofweeknameidfrench}\marg{n}
+%\end{definition}
+%
+%The \styfmt{datetime2} language modules that support the weekday name
+%provide 
+%\begin{definition}[\inpkg{datetime2-\meta{lang}}]
+%\cs{DTM\meta{lang}weekdayname}\marg{dow}
+%\end{definition}
+%which takes a single argument that's an integer from 0 (Monday) to 6
+%(Sunday). As with \styfmt{datetime}, not all of the \styfmt{datetime2}
+%language modules support the weekday.
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%\usepackage{datetime}
+%
+%\begin{document}
+%\dayofweeknameidfrench{1}
+%
+%\dayofweeknameidenglish{1}
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2} with the \module{english} and
+%\module{french} modules):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%\usepackage{datetime2}
+%
+%\begin{document}
+%\DTMfrenchweekdayname{6}
+%
+%\DTMenglishweekdayname{6}
+%\end{document}
+%\end{verbatim}
+%
+%As with the month name, date styles should explicitly use the
+%weekday macro (if provided) for the specific language to display 
+%the weekday name rather than using a macro that varies according to
+%the current language.
+%
+%The \styfmt{datetime} package provides 
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{dayofweeknameid}\marg{n}
+%\end{definition}
+%to provide the weekday name for the current language. If the current language
+%doesn't provide a translation for the weekday names, then the
+%English names are used. This command basically attempts to use
+%\cs{dayofweeknameid\meta{lang}} (where \meta{lang} is given
+%by \cs{languagename}) if it exists otherwise it uses
+%\oldcs{dayofweeknameidenglish}. This language-sensitive macro is a fragile 
+%command that requires protection in moving arguments.
+%
+%As before, if the \styfmt{datetime2-calc} package is loaded, the
+%\sty{pgfcalendar} package's commands are also available including
+%\begin{definition}[\inpkg{pgfcalendar}]
+%\ics{pgfcalendarweekdayname}\marg{dow}
+%\end{definition}
+%where the argument \meta{dow} is an integer from 0 (Monday) to 6
+%(Sunday). Multilingual support is provided through the
+%\sty{translator} package.
+%
+%The \styfmt{datetime2-calc} package also provides a robust
+%language-sensitive command:
+%\begin{definition}[\inpkg{datetime2-calc}]
+%\ics{DTMweekdayname}\marg{dow}
+%\end{definition}
+%This attempts to use \cs{DTM\meta{lang}weekdayname} if it exists,
+%where \meta{lang} is either \cs{languagename} or obtained from the
+%dialect-to-language mapping provided by \sty{tracklang}. If both
+%attempts fail, \cs{DTMweekdayname} will fallback on
+%\cs{pgfcalendarweekdayname} (with a warning through
+%\ics{dtmnamewarning}).
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%
+%\selectlanguage{french}
+%\dayofweeknameid{1}
+%
+%\selectlanguage{english}
+%\dayofweeknameid{1}
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2} with the \module{english} and
+%\module{french} modules):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage[calc]{datetime2}
+%
+%\begin{document}
+%
+%\selectlanguage{french}
+%\DTMweekdayname{6}
+%
+%\selectlanguage{english}
+%\DTMweekdayname{6}
+%\end{document}
+%\end{verbatim}
+%
+%The \styfmt{datetime} package also provides the command
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{dayofweekname}\marg{DD}\marg{MM}\marg{YYYY}
+%\end{definition}
+%that has three arguments: the day of the month,
+%the month number and the year. This calculates the day of week
+%index \meta{n}, an integer from 1 (Sunday) to 7 (Saturday), and then uses the
+%result in the argument of \oldcs{dayofweeknameid}\marg{n}. The
+%\cs{dayofweekname} command was provided by \styfmt{datetime} as a
+%convenient shortcut for use in date styles. (Similarly for
+%\oldcs{shortdayofweekname}.) With the \styfmt{datetime2} date styles, the
+%day-of-week index is automatically available through the fourth
+%argument of \ics{DTMdisplaydate} (and \ics{DTMDisplaydate}), so there
+%is little use for an equivalent command. Additionally, if a date has
+%already been saved with \styfmt{datetime2}, the weekday can be
+%extracted from the saved data through \ics{DTMfetchdow}, which can be
+%used in the argument of commands like \ics{DTMweekdayname} or
+%\ics{DTMenglishweekdayname}.
+%
+%However, if a calculation is required for some reason, it can be
+%obtained using the \sty{pgfcalendar} commands
+%\ics{pgfcalendardatetojulian} and \ics{pgfcalendarjuliantoweekday},
+%which are described in the \styfmt{pgf} manual.
+%
+%The \styfmt{datetime} package provides the conditional
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{ifshowdow}
+%\end{definition}
+%which can be used to determine whether or not styles should display
+%the weekday name (if supported). The \styfmt{datetime2} package has the
+%analogous conditional
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{ifDTMshowdow}
+%\end{definition}
+%
+%The \styfmt{datetime} package provides the command 
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{ordinaldate}\marg{n}
+%\end{definition}
+%as a date-type ordinal where the argument should be an integer from 1
+%to 31. For English, this just uses \sty{fmtcount}'s 
+%non-expandable \cs{ordinalnum} command. For Breton, Welsh and French
+%a suffix is only added when the argument is 1. For all other
+%languages, this command just displays the number.
+%
+%With \styfmt{datetime2}, the language modules may or may not provide a
+%command to display the ordinal but most of them do. For example, the 
+%\module{english} module provides 
+%\begin{definition}[\inpkg{datetime2-english}]
+%\ics{DTMenglishordinal}\marg{n}
+%\end{definition}
+%This displays the suffix using
+%\begin{definition}[\inpkg{datetime2-english}]
+%\ics{DTMenglishfmtordsuffix}\marg{suffix}
+%\end{definition}
+%The definition of this command is changed by the styles provided by
+%the English regional modules. For example, the \style{en-US} style
+%redefines \cs{DTMenglishfmtordsuffix} to ignore its argument.
+%See the documentation for the \module{english} module for further
+%details.
+%
+%The \module{french} module provides:
+%\begin{definition}[\inpkg{datetime2-french}]
+%\ics{DTMfrenchordinal}\marg{n}
+%\end{definition}
+%This displays \meta{n} and if \meta{n} is 1, a suffix is appended.
+%See the \module{french} module documentation for further details.
+%
+%The \module{breton} module provides:
+%\begin{definition}[\inpkg{datetime2-breton}]
+%\ics{DTMbretonordinal}\marg{n}
+%\end{definition}
+%which similarly appends a suffix if \meta{n} is 1 but not for other
+%values. In this case, the suffix for the first day is formatted using
+%\begin{definition}[\inpkg{datetime2-breton}]
+%\ics{DTMbretonfmtordinal}\marg{suffix}
+%\end{definition}
+%which is redefined by the \csopt{DTMlangsetup}{ord} option.
+%See the \module{breton} module documentation for further details.
+%
+%The \module{welsh} module similarly provides:
+%\begin{definition}[\inpkg{datetime2-welsh}]
+%\ics{DTMwelshordinal}\marg{n}
+%\end{definition}
+%and
+%\begin{definition}[\inpkg{datetime2-welsh}]
+%\ics{DTMwelshfmtordinal}\marg{suffix}
+%\end{definition}
+%See the \module{welsh} module documentation for further details.
+%
+%Other modules may simply define \cs{DTM\meta{lang}ordinal} to just
+%display its argument. For example, the \module{german} module
+%provides
+%\begin{definition}[\inpkg{datetime2-german}]
+%\ics{DTMgermanordinal}\marg{n}
+%\end{definition}
+%which just displays \meta{n} (the day of month number).
+%
+%Alternatively, modules may define \cs{DTM\meta{lang}ordinal} to
+%display its argument followed by a full stop (period). For example,
+%the \module{norsk} module provides
+%\begin{definition}[\inpkg{datetime2-norsk}]
+%\ics{DTMnorskordinal}\marg{n}
+%\end{definition}
+%which displays \meta{n} followed by a full stop.
+%
+%As before, the date styles should explicitly use the ordinal macro
+%that matches the style. However, if you have some need to display
+%the day of month independent of any of the styles, you can use
+%\begin{definition}[\inpkg{datetime2-calc}]
+%\ics{DTMordinal}\marg{n}
+%\end{definition}
+%which is provided by \styfmt{datetime2-calc}. This attempts to use 
+%\cs{DTM\meta{lang}ordinal} if it exists, otherwise it just displays
+%\meta{n}.
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%
+%\selectlanguage{french}
+%\ordinaldate{1}
+%
+%\selectlanguage{english}
+%\ordinaldate{1}
+%\end{document}
+%\end{verbatim}
+%This displays 1\textsuperscript{er} in the first case (through 
+%\cs{ordinaldatefrench}) and
+%1\textsuperscript{st} in the second case (through \sty{fmtcount}'s
+%\cs{ordinalnum}).
+%
+%New style (\styfmt{datetime2} with the \module{english} and
+%\module{french} modules):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,english]{babel}
+%
+%\usepackage[calc]{datetime2}
+%
+%\begin{document}
+%
+%\selectlanguage{french}
+%\DTMordinal{1}
+%
+%\selectlanguage{english}
+%\DTMordinal{1}
+%\end{document}
+%\end{verbatim}
+%This displays 1\textsuperscript{er} in the first case and
+%just 1 in the second case, because the regionless \module{english}
+%module doesn't use a suffix.
+%
+%To achieve the same result as the \styfmt{datetime} example, a few
+%modifications are needed:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage[calc,useregional]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise}
+%
+%\begin{document}
+%
+%\selectlanguage{french}
+%\DTMordinal{1}
+%
+%\selectlanguage{british}
+%\DTMordinal{1}
+%\end{document}
+%\end{verbatim}
+%
+%The \styfmt{datetime} package provides the command
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{twodigit}\marg{n}
+%\end{definition}
+%for use in date styles that require two-digit
+%numbers. The \styfmt{datetime2} package provides
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMtwodigits}\marg{n}
+%\end{definition}
+%
+%\section{Saving Dates}
+%
+%The \styfmt{datetime} package provides some commands for saving a date
+%for later use. (There are no equivalent commands for saving a time
+%in \styfmt{datetime}.)
+%With \styfmt{datetime}, a date is saved using
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{newdate}\marg{name}\marg{DD}\marg{MM}\marg{YYYY}
+%\end{definition}
+%With \styfmt{datetime2}, a date can be saved using
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsavedate}\marg{name}\marg{date}
+%\end{definition}
+%where \meta{date} is in the form
+%\texttt{\meta{YYYY}-\meta{MM}-\meta{DD}}.
+%
+%A previously saved date can be displayed with \styfmt{datetime} using:
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{displaydate}\marg{name}
+%\end{definition}
+%With \styfmt{datetime2}, the saved date can be displayed using:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMusedate}\marg{name}
+%\end{definition}
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime}
+%
+%\begin{document}
+%
+%\newdate{mydate}{20}{1}{2016}
+%\displaydate{mydate}
+%
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[en-GB,showdow]{datetime2}
+%
+%\begin{document}
+%
+%\DTMsavedate{mydate}{2016-01-20}
+%\DTMusedate{mydate}
+%
+%\end{document}
+%\end{verbatim}
+%
+%Individual elements of the date can be extracted with the
+%\styfmt{datetime} commands:
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{getdateday}\marg{name}
+%\end{definition}
+%for the day of the month,
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{getdatemonth}\marg{name}
+%\end{definition}
+%for the month number, and
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{getdateyear}\marg{name}
+%\end{definition}
+%for the year.
+%
+%These elements can be fetched in \styfmt{datetime2} using:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMfetchday}\marg{name}
+%\end{definition}
+%for the day of the month,
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMfetchmonth}\marg{name}
+%\end{definition}
+%for the month number, and
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMfetchyear}\marg{name}
+%\end{definition}
+%for the year. Additionally you can fetch the day of week index if it
+%has been computed:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMfetchdow}\marg{name}
+%\end{definition}
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%
+%\newdate{mydate}{20}{1}{2016}
+%
+%Year: \getdateyear{mydate}.
+%Month: \getdatemonth{mydate}.
+%Day: \getdateday{mydate}.
+%
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime2}
+%
+%\begin{document}
+%
+%\DTMsavedate{mydate}{2016-01-20}
+%
+%Year: \DTMfetchyear{mydate}.
+%Month: \DTMfetchmonth{mydate}.
+%Day: \DTMfetchday{mydate}.
+%
+%\end{document}
+%\end{verbatim}
+%
+%With \styfmt{datetime2}, you can also save the current time (as in the
+%time of the document build) with
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsavenow}\marg{name}
+%\end{definition}
+%and then access each field of the date, time and zone.
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%
+%Year: \number\year.
+%Month: \number\month.
+%Day: \number\day.
+%DOW: \computedayofweek{\day}{\month}{\year}\number\dayofweek.
+%
+%Hour: \number\currenthour.
+%Minute: \number\currentminute.
+%Second: \number\currentsecond.
+%
+%\end{document}
+%\end{verbatim}
+%New style (\styfmt{datetime2}):
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[calc]{datetime2}
+%
+%\begin{document}
+%\DTMsavenow{now}
+%
+%Year: \DTMfetchyear{now}.
+%Month: \DTMfetchmonth{now}.
+%Day: \DTMfetchday{now}.
+%DOW: \DTMfetchdow{now}.
+%
+%Hour: \DTMfetchhour{now}.
+%Minute: \DTMfetchminute{now}.
+%Second: \DTMfetchsecond{now}.
+%
+%Time Zone Hour: \DTMfetchTZhour{now}.
+%Time Zone Minute: \DTMfetchTZminute{now}.
+%
+%\end{document}
+%\end{verbatim}
+%(Note that the day of week index is different as \styfmt{datetime2}
+%uses the same indexing system as \sty{pgfcalendar}.)
+%
+%\section{Multilingual Support}
+%
+%The \styfmt{datetime} package comes with the following files (in
+%addition to \texttt{datetime.sty} and
+%\texttt{datetime-defaults.sty}):
+%
+%\begin{center}
+%\begin{tabular}{llll}
+%\texttt{dt-american.def} & \texttt{dt-dutch.def} & \texttt{dt-lsorbian.def} & \texttt{dt-slovak.def}\\
+%\texttt{dt-australian.def} & \texttt{dt-esperanto.def} & \texttt{dt-magyar.def} & \texttt{dt-slovene.def}\\
+%\texttt{dt-austrian.def} & \texttt{dt-estonian.def} & \texttt{dt-naustrian.def} & \texttt{dt-spanish.def}\\
+%\texttt{dt-bahasa.def} & \texttt{dt-finnish.def} & \texttt{dt-newzealand.def} & \texttt{dt-swedish.def}\\
+%\texttt{dt-basque.def} & \texttt{dt-french.def} & \texttt{dt-ngerman.def} & \texttt{dt-turkish.def}\\
+%\texttt{dt-breton.def} & \texttt{dt-galician.def} & \texttt{dt-norsk.def} & \texttt{dt-UKenglish.def}\\
+%\texttt{dt-british.def} & \texttt{dt-german.def} & \texttt{dt-polish.def} & \texttt{dt-ukraineb.def}\\
+%\texttt{dt-bulgarian.def} & \texttt{dt-greek.def} & \texttt{dt-portuges.def} & \texttt{dt-USenglish.def}\\
+%\texttt{dt-canadian.def} & \texttt{dt-hebrew.def} & \texttt{dt-romanian.def} & \texttt{dt-usorbian.def}\\
+%\texttt{dt-catalan.def} & \texttt{dt-icelandic.def} & \texttt{dt-russian.def} & \texttt{dt-welsh.def}\\
+%\texttt{dt-croatian.def} & \texttt{dt-irish.def} & \texttt{dt-samin.def}\\
+%\texttt{dt-czech.def} & \texttt{dt-italian.def} & \texttt{dt-scottish.def}\\
+%\texttt{dt-danish.def} & \texttt{dt-latin.def} & \texttt{dt-serbian.def}
+%\end{tabular}
+%\end{center}
+%
+%These \texttt{dt-\meta{lang}.def} files provide the code to integrate
+%\styfmt{datetime} with \sty{babel} for each language given by \meta{lang}.
+%This means that if you have \styfmt{datetime} installed and there's a
+%\texttt{.def} file that matches the language you are using with
+%\sty{babel}, then all you need to do is load \sty{babel} before
+%\styfmt{datetime}.
+%
+%With \styfmt{datetime2}, language support is provided in separate
+%independently-maintained modules. The actual \styfmt{datetime2} package
+%itself just comes with two files: \texttt{datetime2.sty} and
+%\texttt{datetime2-calc.sty}. This means that if you only want to use
+%the basic numeric styles and aren't using \sty{babel} or
+%\sty{polyglossia}, then that's all you need. (Although you'll
+%obviously need to install dependent packages, such as \styfmt{pgf}
+%which provides the \sty{pgfcalendar} package used by
+%\styfmt{datetime2-calc}. However \sty{fmtcount}, which is required by
+%\styfmt{datetime}, isn't required by \styfmt{datetime2}.)
+%
+%If you want to use \styfmt{datetime2} with language support, then you
+%only need to install the modules for the required language. For
+%example, if you only use English, you can just install the
+%\module{english} module and if you only use French, you can just
+%install the \module{french} module.
+%
+%At the time of writing, the following modules are available on CTAN:
+%\begin{center}
+%\begin{tabular}{lll}
+%\module[bahasai]{datetime2-bahasai} & \module[galician]{datetime2-galician} & \module[russian]{datetime2-russian} \\
+%\module[basque]{datetime2-basque} & \module[german]{datetime2-german} & \module[samin]{datetime2-samin} \\
+%\module[breton]{datetime2-breton} & \module[greek]{datetime2-greek} & \module[scottish]{datetime2-scottish} \\
+%\module[bulgarian]{datetime2-bulgarian} & \module[hebrew]{datetime2-hebrew} & \module[serbian]{datetime2-serbian} \\
+%\module[catalan]{datetime2-catalan} & \module[icelandic]{datetime2-icelandic} & \module[slovak]{datetime2-slovak} \\
+%\module[croatian]{datetime2-croatian} & \module[irish]{datetime2-irish} & \module[slovene]{datetime2-slovene} \\
+%\module[czech]{datetime2-czech} & \module[italian]{datetime2-italian} & \module[spanish]{datetime2-spanish} \\
+%\module[danish]{datetime2-danish} & \module[latin]{datetime2-latin} & \module[swedish]{datetime2-swedish} \\
+%\module[dutch]{datetime2-dutch} & \module[lsorbian]{datetime2-lsorbian} & \module[turkish]{datetime2-turkish} \\
+%\module[english]{datetime2-english} & \module[magyar]{datetime2-magyar} & \module[ukrainian]{datetime2-ukrainian} \\
+%\module[esperanto]{datetime2-esperanto} & \module[norsk]{datetime2-norsk} & \module[usorbian]{datetime2-usorbian} \\
+%\module[estonian]{datetime2-estonian} & \module[polish]{datetime2-polish} & \module[welsh]{datetime2-welsh} \\
+%\module[finnish]{datetime2-finnish} & \module[portuges]{datetime2-portuges} \\
+%\module[french]{datetime2-french} & \module[romanian]{datetime2-romanian}
+%\end{tabular}
+%\end{center}
+%Some of these only support the root language but some, such as
+%\module{english}, provide support for different regions. There is
+%also a supplementary package \sty{datetime2-en-fulltext} that
+%replicates \styfmt{datetime}'s \texttt{text} and \texttt{oclock}
+%styles (and requires \sty{fmtcount}).
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage{datetime}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%21 janvier 2016\par
+%Thursday 21\textsuperscript{st} January, 2016
+%\end{quote}
+%
+%New style (\styfmt{datetime2}, \sty{datetime2-english} and \sty{datetime2-french}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage[showdow,useregional]{datetime2}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%21 janvier 2016\par
+%Thursday 21st January 2016
+%\end{quote}
+%There's a slight difference in the appearance of the British date.
+%An exact reproduction of the \styfmt{datetime} format can be achieved
+%by modifying the \style{en-GB} options:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage[showdow,useregional]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space}}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%Note that neither \styfmt{dt-french.def} from \styfmt{datetime} nor 
+%\sty{datetime2-french} support
+%the show day of week option.
+%
+%The \styfmt{datetime} package provides:
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{setdefaultdate}\marg{date declaration}
+%\end{definition}
+%to always use the date style given by \meta{date declaration}
+%instead of letting \sty{babel} switch the date format every time the
+%language changes.
+%
+%In \styfmt{datetime2}, the default is the reverse: the style won't
+%change when the language changes unless the languages (or regions)
+%have been listed in the \styfmt{datetime2} package options. If the
+%regional styles have been enabled, allowing \sty{babel} to change
+%the date style whenever the language changes, then you can switch
+%this behaviour off by setting the \pkgopt{useregional} option to
+%\pkgoptfmt{false}.
+%
+%Old style (\styfmt{datetime}):
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage{datetime}
+%
+%\yyyymmdddate
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%21 janvier 2016\par
+%Thursday 21\textsuperscript{st} January, 2016
+%\end{quote}
+%(The numeric date style has been overridden.)
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage{datetime2}
+%
+%\DTMsetdatestyle{iso}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%2016-01-21\par
+%2016-01-21
+%\end{quote}
+%(The ISO date style overrides the language setting.)
+%
+%Compare this to:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage[en-GB,fr-FR]{datetime2}
+%
+%\DTMsetdatestyle{iso}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%21 janvier 2016\par
+%21st January 2016
+%\end{quote}
+%
+%Examples that explicitly suppress the language-sensitive dates
+%follow. First with \styfmt{datetime}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage{datetime}
+%
+%\setdefaultdate{\yyyymmdddate}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%2016/01/21\par
+%2016/01/21
+%\end{quote}
+%
+%Now with \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage[T1]{fontenc}
+%\usepackage[utf8]{inputenc}
+%\usepackage[french,british]{babel}
+%
+%\usepackage[en-GB,fr-FR,useregional=false]{datetime2}
+%
+%\DTMsetdatestyle{iso}
+%
+%\begin{document}
+%\selectlanguage{french}
+%\today
+%
+%\selectlanguage{british}
+%\today
+%
+%\end{document}
+%\end{verbatim}
+%This produces:
+%\begin{quote}
+%2016-01-21\par
+%2016-01-21
+%\end{quote}
+%
+%\section{Predefined Date Formats}
+%
+%The \styfmt{datetime} date styles were set with declarations such as
+%\cs{longdate} (or package options that used the associated
+%declaration, such as \pkgoptfmt{long}).
+%With \styfmt{datetime2}, date styles are set using
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsetdatestyle}\marg{style name}
+%\end{definition}
+%(which just changes the date style without changing the time style) or
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsetstyle}\marg{style name}
+%\end{definition}
+%which sets the full date-time style.
+%
+%This section lists the \styfmt{datetime} declarations and how the
+%same style can be set through \styfmt{datetime2}.
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{yyyymmdddate}
+%\end{definition}
+%By default this style produces a date in the form 2016/01/20. (The
+%separator is governed by \oldcs{dateseparator}.) This is the default
+%style for \styfmt{datetime2} with the exception of the separator,
+%which defaults to a hyphen. To reproduce the \styfmt{datetime}
+%format, you can set the date style to \style{default} (if it has
+%been previous changed from the default) and change the separator
+%with the \pkgopt{datesep} option:
+%\begin{verbatim}
+%\DTMsetdatestyle{default}
+%\DTMsetup{datesep={/}}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{longdate}
+%\end{definition}
+%This is the default date format for \styfmt{datetime} and this style produces
+%the date in the form: Wednesday 8\textsuperscript{th} March, 2000.
+%This is actually a regional style for some of the English dialects,
+%so with \styfmt{datetime2} this additionally needs the
+%\module{english} module installed. To exactly replicate this date
+%format, including the day of week name, the superscript ordinal
+%suffix and the comma after the month name, you need the
+%\pkgopt{showdow} and \pkgopt{en-GB} package options and 
+%the \csopt{DTMlangsetup}{ord} and \csopt{DTMlangsetup}{monthyearsep}
+%options for the \style{en-GB} style. For example:
+%\begin{verbatim}
+%\usepackage[showdow,en-GB]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space}}
+%\end{verbatim}
+%Another possibility is:
+%\begin{verbatim}
+%\usepackage[british]{babel}
+%\usepackage[showdow]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space}}
+%\DTMsetdatestyle{en-GB}
+%\end{verbatim}
+%There are other regional styles in the \module{english} module that
+%produce the same format, such as \style{en-GG}.
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{shortdate}
+%\end{definition}
+%This is similar to \cs{longdate} but uses abbreviated names to
+%produce a date in the form: Wed 8\textsuperscript{th} Mar, 2000.
+%With \styfmt{datetime2}, this is like the above but additionally
+%needs the \csopt{DTMlangsetup}{abbr} option for the \style{en-GB}
+%style:
+%\begin{verbatim}
+%\usepackage[showdow,en-GB]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space},abbr}
+%\end{verbatim}
+%or
+%\begin{verbatim}
+%\usepackage[british]{babel}
+%\usepackage[showdow]{datetime2}
+%\DTMlangsetup[en-GB]{ord=raise,monthyearsep={,\space},abbr}
+%\DTMsetdatestyle{en-GB}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{ddmmyyyydate}
+%\end{definition}
+%This produces a date in the form 08/03/2000. This can be reproduced
+%with just \styfmt{datetime2} using the \style{ddmmyyyy} style with
+%the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetdatestyle{ddmmyyyy}
+%\DTMsetup{datesep=/}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{dmyyyydate}
+%\end{definition}
+%This produces a date in the form 8/3/2000. This can be reproduced
+%with just \styfmt{datetime2} using the \style{dmyyyy} style with
+%the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetdatestyle{dmyyyy}
+%\DTMsetup{datesep=/}
+%\end{verbatim}
+%This format is also the style of some of the regional numeric date
+%styles. For example, with the \module{english} module:
+%\begin{verbatim}
+%\usepackage[british]{babel}
+%\usepackage{datetime2}
+%\DTMsetdatestyle{en-GB-numeric}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{ddmmyydate}
+%\end{definition}
+%This produces a date in the form 08/03/00. This can be reproduced
+%with just \styfmt{datetime2} using the \style{ddmmyy} style with
+%the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetdatestyle{ddmmyy}
+%\DTMsetup{datesep=/}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{dmyydate}
+%\end{definition}
+%This produces a date in the form 8/3/00. This can be reproduced
+%with just \styfmt{datetime2} using the \style{dmyy} style with
+%the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetdatestyle{dmyy}
+%\DTMsetup{datesep=/}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{textdate}
+%\end{definition}
+%This style is designed to produce a full text British date in the
+%form: Wednesday the Eighth of March, Two Thousand. The
+%\sty{datetime2-en-fulltext} package is required to reproduce this
+%style:
+%\begin{verbatim}
+%\usepackage[showdow]{datetime2-en-fulltext}
+%\DTMsetdatestyle{en-FullText}
+%\end{verbatim}
+%Note that with both \styfmt{datetime} and
+%\styfmt{datetime2-en-fulltext} this style should not be used if the
+%current language isn't English.
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{usdate}
+%\end{definition}
+%This style is designed to produce \TeX's default US date format in
+%the form March 8, 2000. This style can be reproduced with
+%\styfmt{datetime2} and the \module{english} module:
+%\begin{verbatim}
+%\usepackage[en-US]{datetime2}
+%\end{verbatim}
+%or
+%\begin{verbatim}
+%\usepackage[USenglish]{babel}
+%\usepackage[useregional]{datetime2}
+%\DTMsetdatestyle{en-US}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{mmddyyyydate}
+%\end{definition}
+%This style produces a date in a middle-endian format in the form:
+%03/08/2000. This style can be reproduced with \styfmt{datetime2} using
+%the \style{mmddyyyy} style with the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetup{datesep=/}
+%\DTMsetdatestyle{mmddyyyy}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{mdyyyydate}
+%\end{definition}
+%This style produces a date in a middle-endian format in the form:
+%3/8/2000. This style can be reproduced with \styfmt{datetime2} using
+%the \style{mdyyyy} style with the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetup{datesep=/}
+%\DTMsetdatestyle{mdyyyy}
+%\end{verbatim}
+%This format is also the style of some of the regional numeric date
+%styles. For example, with the \module{english} module:
+%\begin{verbatim}
+%\usepackage[USenglish]{babel}
+%\usepackage{datetime2}
+%\DTMsetdatestyle{en-US-numeric}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{mmddyydate}
+%\end{definition}
+%This style produces a date in a middle-endian format in the form:
+%03/08/00. This style can be reproduced with \styfmt{datetime2} using
+%the \style{mmddyy} style with the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetup{datesep=/}
+%\DTMsetdatestyle{mmddyy}
+%\end{verbatim}
+%
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{mdyydate}
+%\end{definition}
+%This style produces a date in a middle-endian format in the form:
+%3/8/00. This style can be reproduced with \styfmt{datetime2} using
+%the \style{mdyy} style with the date separator set to a slash:
+%\begin{verbatim}
+%\DTMsetup{datesep=/}
+%\DTMsetdatestyle{mdyy}
+%\end{verbatim}
+%
+%\section{Predefined Time Formats}
+%
+%The time formats are set in \styfmt{datetime} using
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{settimeformat}\marg{style-name}
+%\end{definition}
+%With \styfmt{datetime2}, the time styles are set using
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsettimestyle}\marg{style-name}
+%\end{definition}
+%(which just changes the time style without changing the date style) or
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMsetstyle}\marg{style name}
+%\end{definition}
+%which sets the full date-time style.
+%
+%The \styfmt{datetime} package provides the following time styles:
+%\begin{description}
+%\item[xxivtime] This style produces the time in twenty-four hour
+%format in the form 09:28. (The default time style for
+%\styfmt{datetime}.) Note that this style has no seconds. The format
+%can be reproduced in \styfmt{datetime2} with the \style{default}
+%style and the \pkgopt{showseconds} option set to \pkgoptfmt{false}:
+%\begin{verbatim}
+%\DTMsettimestyle{default}
+%\DTMsetup{showseconds=false}
+%\end{verbatim}
+%
+%\item[hhmmsstime] This is like the previous style but includes the
+%seconds. This is the default time style for \styfmt{datetime2}:
+%\begin{verbatim}
+%\DTMsettimestyle{default}
+%\end{verbatim}
+%
+%\item[ampmtime] This style produces the time in twelve hour format
+%in the form 9:28am or 7:54pm. This style is available in some of the
+%regional modules for \styfmt{datetime2}. For example, using the
+%\style{en-GB} style in the \module{english} module:
+%\begin{verbatim}
+%\usepackage[en-GB]{datetime2}
+%\end{verbatim}
+%or
+%\begin{verbatim}
+%\usepackage[british]{babel}
+%\usepackage{datetime2}
+%\DTMsettimestyle{en-GB}
+%\end{verbatim}
+%
+%\item[oclock] This style is designed for a full text English time
+%format in the form: Twenty-Eight minutes past Ten in the afternoon.
+%This style can be reproduced with the \style{en-FullText} style
+%provided by the \sty{datetime2-en-fulltext} package:
+%\begin{verbatim}
+%\usepackage{datetime2-en-fulltext}
+%\DTMsettimestyle{en-FullText}
+%\end{verbatim}
+%
+%\end{description}
+%
+%\section{Defining a New Date Format}
+%
+%The \styfmt{datetime} package provides:
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{newdateformat}\marg{name}\marg{format}
+%\end{definition}
+%to define a new date style. Within \meta{format}, the placeholder
+%commands \oldcs{THEDAY}, \oldcs{THEMONTH} and \oldcs{THEYEAR} are
+%used to represent the relevant day, month and year values. There are
+%also counter placeholders \texttt{DAY}, \texttt{MONTH} and
+%\texttt{YEAR}, which may be used instead.
+%
+%A necessary consequence of allowing placeholder commands in
+%\meta{format} means that these commands must be set as appropriate
+%before the date can be formatted. This means that the formatted date
+%can't be expanded and the date commands must be made robust to
+%protect them in moving arguments. This is an inherent problem with the
+%\styfmt{datetime} package that can't be fixed without breaking
+%backwards compatibility and is one of the main reasons for
+%introducing the replacement \styfmt{datetime2} package.
+%
+%The \styfmt{datetime2} package provides a better way of providing
+%date styles, which are defined using:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMnewdatestyle}\marg{name}\marg{definition}
+%\end{definition}
+%Instead of using placeholder commands, the date styles
+%simply redefine the date formatting macros within \meta{definition}.
+%There are two principle date formatting commands that the date style
+%must define although styles may redefine additional helper commands
+%if necessary.
+%
+%The two main date formatting commands are:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMdisplaydate}\marg{YYYY}\marg{MM}\marg{DD}\marg{dow}
+%\end{definition}
+%for use where no case-changing is required and
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMDisplaydate}\marg{YYYY}\marg{MM}\marg{DD}\marg{dow}
+%\end{definition}
+%for use where the date must begin with an upper case letter, for
+%example if the date occurs at the start of a sentence. For styles
+%where the case-change is irrelevant (for example, numeric styles or
+%styles that always start with an upper case letter), the
+%\cs{DTMDisplaydate} command may simply be set to
+%\cs{DTMdisplaydate}.
+%
+%The \styfmt{datetime} manual provides some examples of new date
+%styles. The first is simply a numeric little-endian style with a hyphen 
+%separating each number:
+%\begin{verbatim}
+%\newdateformat{mydate}{\THEDAY-\THEMONTH-\THEYEAR}
+%\end{verbatim}
+%
+%To convert this into a \styfmt{datetime2} format, the new style
+%simply needs to redefine \cs{DTMdisplaydate} so that it has the
+%following definition:
+%\begin{verbatim}
+%\renewcommand{\DTMdisplaydate}[4]{#3-#2-#1}
+%\end{verbatim}
+%Note that this command must always have four arguments, even if one
+%or more of them are ignored. So here \cs{THEYEAR} is just the first
+%argument \verb|#1|, \cs{THEMONTH} is the second argument \verb|#2|
+%and \cs{THEDAY} is the third argument \verb|#3|. One other thing to note is
+%that the arguments may be supplied with a leading zero. If you want
+%to trim this off, you can use \TeX's \ics{number} primitive. For
+%example:
+%\begin{verbatim}
+%\renewcommand{\DTMdisplaydate}[4]{\number#3-\number#2-\number#1 }
+%\end{verbatim}
+%This is the better method to allow for, say, registers used in any
+%of the arguments.
+%
+%Therefore this new date style can be defined for \styfmt{datetime2}
+%as follows:
+%\begin{verbatim}
+%\DTMnewdatestyle{mydate}{%
+% \renewcommand{\DTMdisplaydate}[4]{\number##3-\number##2-\number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\end{verbatim}
+%(Note the need to double the \verb|#| in the parameters, as is usual
+%when redefining a command within another command in this manner.)
+%
+%For example, using \styfmt{datetime}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime}
+%
+%\newdateformat{mydate}{\THEDAY-\THEMONTH-\THEYEAR}
+%\mydate
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%Now using \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2}
+%
+%\DTMnewdatestyle{mydate}{%
+% \renewcommand{\DTMdisplaydate}[4]{\number##3-\number##2-\number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{mydate}
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%
+%Another example provided in the \styfmt{datetime} manual ensures two
+%digits for the month and day of month:
+%\begin{verbatim}
+%\newdateformat{dashdate}{\twodigit{\THEDAY}-\twodigit{\THEMONTH}-\THEYEAR}
+%\end{verbatim}
+%
+%This is a minor modification to the previous example. The two digit
+%number format can be obtained through \styfmt{datetime2}'s
+%\ics{DTMtwodigits} command:
+%\begin{verbatim}
+%\DTMnewdatestyle{dashdate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%   \DTMtwodigits{##3}-\DTMtwodigits{##2}-\number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\end{verbatim}
+%
+%A complete example follows for \styfmt{datetime}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime}
+%
+%\newdateformat{dashdate}{\twodigit{\THEDAY}-\twodigit{\THEMONTH}-\THEYEAR}
+%\dashdate
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%And for \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%\usepackage{datetime2}
+%
+%\DTMnewdatestyle{dashdate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMtwodigits{##3}-\DTMtwodigits{##2}-\number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{dashdate}
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%
+%You may have noticed that there's no equivalent of
+%\styfmt{datetime}'s counter placeholders, but there's no real need
+%for them and any attempt at implementing them would return to the
+%original problem of preventing an expandable date format. \LaTeX\
+%counters all internally use \TeX\ count registers and counter
+%formatting commands have to access those registers to determine the
+%counter value.
+%
+%To illustrate this, the \styfmt{datetime} manual provides the
+%example:
+%\begin{verbatim}
+%\newdateformat{usvardate}{\monthname[\THEMONTH] \ordinal{DAY}, \THEYEAR}
+%\end{verbatim}
+%This uses the \texttt{DAY} counter placeholder since \cs{ordinal}
+%(provided by the \sty{fmtcount} package) requires a counter name as
+%the argument. However, \cs{ordinal} internally uses \cs{ordinalnum}
+%with the internal count register as the argument, so the format
+%could just as easily be defined as:
+%\begin{verbatim}
+%\newdateformat{usvardate}{\monthname[\THEMONTH] \ordinalnum{\THEDAY}, \THEYEAR}
+%\end{verbatim}
+%
+%So how can this style be reproduced with \styfmt{datetime2}? A
+%na\"ive approach is:
+%\begin{verbatim}
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\end{verbatim}
+%This requires both \styfmt{datetime2-calc} (for \ics{DTMmonthname})
+%and \sty{fmtcount} (for \cs{ordinalnum}).
+%
+%A complete example that uses it:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{fmtcount}
+%\usepackage[calc]{datetime2}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%This produces a warning from \cs{DTMmonthname} because
+%\cs{DTMenglishmonthname} hasn't been defined, so it uses 
+%\cs{pgfcalendarmonthname} instead. The document displays the text:
+%\begin{quote}
+%January 1\textsuperscript{st}, 2016.
+%\end{quote}
+%This seems to produce the correct output, but let's see what happens
+%if we make a minor modification to the example:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[english,french]{babel}
+%\usepackage{fmtcount}
+%\usepackage[calc]{datetime2}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\begin{document}
+%\today.
+%\end{document}
+%\end{verbatim}
+%This now produces:
+%\begin{quote}
+%janvier 1\textsuperscript{er}, 2016.
+%\end{quote}
+%which doesn't match the rationale of the style being a variation of
+%the standard US date style nor does it match the little-endian
+%syntax of French dates.
+%
+%Now let's make another minor change to the example:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{fmtcount}
+%\usepackage[calc]{datetime2}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%This document can't compile properly and causes the error:
+%\begin{verbatim}
+%! Argument of \@sect has an extra }.
+%<inserted text> 
+%                \par 
+%\end{verbatim}
+%This is because the style definition has made \cs{today} fragile
+%because it uses an unprotected fragile command. This can be fixed by
+%protecting \cs{ordinalnum} in the style definition.
+%
+%Let's make another modification:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{fmtcount}
+%\usepackage[calc]{datetime2}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \protect\ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\pagestyle{headings}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%This compiles without error now that \cs{ordinalnum} has been
+%protected, but the page header appears as:
+%\begin{quote}
+%\emph{1\quad January 1\textsuperscript{st}, 2016: AN EXAMPLE}\hfill 1
+%\end{quote}
+%The date hasn't been rendered in upper case so the header doesn't
+%look right.
+%
+%If \sty{hyperref} is added, another problem becomes evident:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{fmtcount}
+%\usepackage[calc]{datetime2}
+%\usepackage[colorlinks]{hyperref}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMmonthname{##2} \protect\ordinalnum{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\pagestyle{headings}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%The PDF bookmarks for this document show the section title as:
+%\begin{quote}
+%01 , 2016: an example
+%\end{quote}
+%
+%Both the header and the bookmark problem are caused by
+%non-expandable elements of the date style. \emph{The same problems
+%occur with \styfmt{datetime}}, and is one of the main reasons for
+%developing a replacement package since these problems can't be fixed
+%by \styfmt{datetime}. In fact, the \styfmt{datetime} version of this
+%example looks even worse in the bookmarks:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime}
+%\usepackage[colorlinks]{hyperref}
+%
+%\newdateformat{usvardate}{\monthname[\THEMONTH] \ordinalnum{\THEDAY}, \THEYEAR}
+%\usvardate
+%
+%\pagestyle{headings}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%The bookmark now looks like:
+%\begin{quote}
+%===[0], 0: an example
+%\end{quote}
+%(The page header is the same as for the \styfmt{datetime2} example
+%above, with the date not matching the rest of the heading case.)
+%
+%A more appropriate way of defining this style with
+%\styfmt{datetime2} package is to use the \emph{expandable} commands
+%provided by the \module{english} module:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[calc,en-GB]{datetime2}
+%\usepackage[colorlinks]{hyperref}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand*{\DTMenglishfmtordsuffix}{\DTMenGBfmtordsuffix}%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMenglishmonthname{##2} \DTMenglishordinal{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\pagestyle{headings}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%This fixes both the header and the bookmarks.
+%
+%If you don't want to rely on remembering to use the \pkgopt{en-GB}
+%option to load the \style{en-GB} style (which defines
+%\cs{DTMenGBfmtordsuffix}) you can use this alternative:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage[calc]{datetime2}
+%\usepackage[colorlinks]{hyperref}
+%
+%\DTMusemodule{english}{en-GB}
+%
+%\DTMnewdatestyle{usvardate}{%
+% \renewcommand*{\DTMenglishfmtordsuffix}{\DTMenGBfmtordsuffix}%
+% \renewcommand{\DTMdisplaydate}[4]{%
+%  \DTMenglishmonthname{##2} \DTMenglishordinal{##2}, \number##1 }%
+% \renewcommand{\DTMDisplaydate}{\DTMdisplaydate}%
+%}
+%\DTMsetdatestyle{usvardate}
+%
+%\pagestyle{headings}
+%
+%\begin{document}
+%\section{\today: an example}
+%
+%\today.
+%\end{document}
+%\end{verbatim}
+%This is a useful method to employ if you want to define the new
+%style in a package without forcing the package options used to load
+%\styfmt{datetime2}.
+%
+%Note that this new style definition is unaffected by language
+%changes, so the other problem with the \styfmt{datetime} version of
+%this style is also eliminated.
+%
+%\section{Defining a New Time Format}
+%
+%The \styfmt{datetime} package provides:
+%\begin{definition}[\inpkg{datetime}]
+%\oldcs{newtimeformat}\marg{name}\marg{format}
+%\end{definition}
+%to define a new time style. Within \meta{format}, the placeholder
+%commands \oldcs{THEHOUR}, \oldcs{THEMINUTE}, \oldcs{THESECOND},
+%\oldcs{THEHOURXII}, \oldcs{THETOHOUR}, \oldcs{THETOMINUTE} may be
+%used. There are also corresponding placeholder counters:
+%\texttt{HOUR}, \texttt{MINUTE}, \texttt{SECOND}, \texttt{HOURXII},
+%\texttt{TOHOUR} and \texttt{TOMINUTE}.
+%
+%This placeholder style of format for the time has the same problems
+%as that for the date styles described in the previous section.
+%
+%Time styles are defined in \styfmt{datetime2} using:
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMnewtimestyle}\marg{name}\marg{definition}
+%\end{definition}
+%
+%As with the date styles, the \styfmt{datetime2} package provides
+%styles that redefine a formatting macro. In this case, the time
+%(without the zone) is simply formatted with
+%\begin{definition}[\inpkg{datetime2}]
+%\ics{DTMdisplaytime}\marg{hh}\marg{mm}\marg{ss}
+%\end{definition}
+%so the \meta{definition} part of \cs{DTMnewtimestyle} needs to
+%redefine this command.
+%
+%The placeholder commands \cs{THEHOUR}, \cs{THEMINUTE}
+%and \cs{THESECOND} from \styfmt{datetime} can now be represented by
+%the first, second and third arguments of \cs{DTMdisplaytime}. The
+%other placeholders are more complicated as they need to be
+%calculated which may prevent the style from being an expandable
+%format.
+%
+%The \styfmt{datetime} manual provides a simple example of defining a
+%new time style:
+%\begin{verbatim}
+%\newtimeformat{dottime}{\twodigit{\THEHOUR}.\twodigit{\THEMINUTE}}
+%\end{verbatim}
+%This style is then set using:
+%\begin{verbatim}
+%\settimeformat{dottime}
+%\end{verbatim}
+%
+%An equivalent time style can be defined with \styfmt{datetime2}:
+%\begin{verbatim}
+%\DTMnewtimestyle{dottime}{%
+% \renewcommand*\DTMdisplaytime[3]{\DTMtwodigits{##1}.\DTMtwodigits{##2}}}
+%\end{verbatim}
+%
+%A complete example using \styfmt{datetime}:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime}
+%
+%\newtimeformat{dottime}{\twodigit{\THEHOUR}.\twodigit{\THEMINUTE}}
+%\settimeformat{dottime}
+%
+%\begin{document}
+%\currenttime.
+%\end{document}
+%\end{verbatim}
+%A complete example using \styfmt{datetime2}:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime2}
+%
+%\DTMnewtimestyle{dottime}{%
+% \renewcommand*\DTMdisplaytime[3]{\DTMtwodigits{##1}.\DTMtwodigits{##2}}}
+%\DTMsettimestyle{dottime}
+%
+%\begin{document}
+%\DTMcurrenttime.
+%\end{document}
+%\end{verbatim}
+%
+%Note that the \styfmt{datetime} example has a problem with PDF
+%bookmarks if the time is used in a sectioning command, for the same
+%reasons as those discussed above in the previous section. This can
+%be seen with a slight modification to the example:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime}
+%\usepackage[colorlinks]{hyperref}
+%
+%\newtimeformat{dottime}{\twodigit{\THEHOUR}.\twodigit{\THEMINUTE}}
+%\settimeformat{dottime}
+%
+%\begin{document}
+%\section{\currenttime: an example}
+%
+%\currenttime.
+%\end{document}
+%\end{verbatim}
+%The bookmark appears as:
+%\begin{quote}
+%====by 1=by 12by 12 by -=by -60by -1=0.00: an example
+%\end{quote}
+%
+%The \styfmt{datetime2} example works fine with a similar
+%modification:
+%\begin{verbatim}
+%\documentclass{article}
+%
+%\usepackage{datetime2}
+%\usepackage[colorlinks]{hyperref}
+%
+%\DTMnewtimestyle{dottime}{%
+% \renewcommand*\DTMdisplaytime[3]{\DTMtwodigits{##1}.\DTMtwodigits{##2}}}
+%\DTMsettimestyle{dottime}
+%
+%\begin{document}
+%\section{\DTMcurrenttime: an example}
+%
+%\DTMcurrenttime.
+%\end{document}
+%\end{verbatim}
+%
+%There is one slight drawback with this example that's irrelevant to the choice
+%of package. The bookmark (and table of contents, if present) will always show
+%the time from the previous \LaTeX\ run.  This is only a problem when using the
+%current time, especially if seconds are required or the document build takes
+%longer than a minute. If the example has a specific time instead of one that
+%changes for every \LaTeX\ run, then this issue is eliminated.
+%
+%If you want a time style that requires the other placeholder
+%commands provided by \styfmt{datetime}, then it's more complicated
+%to convert to \styfmt{datetime2} as the values that
+%\styfmt{datetime} conveniently computes and stores in the
+%placeholder commands \oldcs{THEHOURXII}, \oldcs{THETOHOUR} and
+%\oldcs{THETOMINUTE} now need to be calculated, preferably in an
+%expandable way.
+%
+%An expandable twelve hour time format can be illustrated with the
+%\style{englishampm} style provided by the \module{english}
+%module:\footnote{Bug fix from \styfmt{datetime2-english} v1.03
+%included}
+%\begin{verbatim}
+%\DTMnewtimestyle
+% {englishampm}% label
+% {%
+%    \renewcommand*\DTMdisplaytime[3]{%
+%      \ifnum##2=0
+%        \ifnum##1=12
+%          \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglishnoon}}%
+%            {\DTMenglishnoon}%
+%        \else
+%          \ifnum##1=0
+%            \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglishmidnight}}%
+%            {\DTMenglishmidnight}%
+%          \else
+%            \ifnum##1=24
+%              \DTMtexorpdfstring
+%              {\DTMenglishampmfmt{\DTMenglishmidnight}}%
+%              {\DTMenglishmidnight}%
+%            \else
+%              \ifnum##1<12
+%                \number##1
+%                \DTMtexorpdfstring
+%                {\DTMenglishampmfmt{\DTMenglisham}}%
+%                {\DTMenglisham}%
+%              \else
+%                \number\numexpr##1-12\relax
+%                \DTMtexorpdfstring
+%                {\DTMenglishampmfmt{\DTMenglishpm}}%
+%                {\DTMenglishpm}%
+%              \fi
+%              \fi
+%            \fi
+%          \fi
+%        \fi
+%      \else
+%        \ifnum##1<13
+%          \ifnum##1=0
+%            12%
+%          \else
+%            \number##1
+%          \fi
+%          \DTMenglishtimesep\DTMtwodigits{##2}%
+%          \ifnum##1=12
+%            \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglishpm}}%
+%            {\DTMenglishpm}%
+%          \else
+%            \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglisham}}%
+%            {\DTMenglisham}%
+%          \fi
+%        \else
+%          \number\numexpr##1-12\relax
+%          \DTMenglishtimesep\DTMtwodigits{##2}%
+%          \ifnum##1=24
+%            \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglisham}}%
+%            {\DTMenglisham}%
+%          \else
+%            \DTMtexorpdfstring
+%            {\DTMenglishampmfmt{\DTMenglishpm}}%
+%            {\DTMenglishpm}%
+%          \fi
+%        \fi
+%      \fi
+%    }%
+% }%
+%\end{verbatim}
+%
+%This is certainly more complicated than the
+%\texttt{ampmtime} format provided by \styfmt{datetime}, which is
+%defined as:
+%\begin{verbatim}
+%\newtimeformat{ampmtime}%
+%{%
+% \ifthenelse{\value{HOUR}=0}{12}{\THEHOURXII}%
+% \timeseparator
+% \twodigit{\THEMINUTE}%
+% \ifthenelse{\value{HOUR}<12}{\amname}%
+% {%
+%   \ifthenelse{\value{HOUR}=12}{ \noon}{\pmname}%
+% }%
+%}
+%\end{verbatim}
+%However the \styfmt{datetime2} version produces better results,
+%especially where expansion is required (for example, in bookmarks or
+%writing a time stamp to an external file). The \styfmt{datetime2}
+%version also performs extra checks for midnight where the
+%\styfmt{datetime} version produces ambiguous text. So the
+%\texttt{ampmtime} definition is simple but buggy.
+%
+%The basic algorithm for \style{englishampm} is:
+%\begin{description}
+%\item If the minute value is 0 (\verb|\ifnum##2=0|):
+% \begin{description}
+%  \item If the hour value is 12 (\verb|\ifnum##1=12|):
+%   \begin{description}
+%    \item Print \qt{noon}
+%   \end{description}
+%
+%  \item Otherwise (not noon but on the hour)
+%
+%   \begin{description}
+%    \item If the hour value is 0 (\verb|\ifnum##1=0|)
+%     \begin{description}
+%      \item Print \qt{midnight}
+%     \end{description}
+%
+%    \item Otherwise (not 12:00 or 00:00 but on the hour)
+%
+%     \begin{description}
+%      \item If the hour value is 24 (\verb|\ifnum##1=24|)
+%       \begin{description}
+%        \item Print \qt{midnight}
+%       \end{description}
+%
+%      \item Otherwise (not 12:00 or 00:00 or 24:00 but on the hour)
+%       \begin{description}
+%        \item If the hour value is less than 12 (\verb|\ifnum##1<12|)
+%          \begin{description}
+%           \item Print the hour value (\verb|\number##1|)
+%           \item Print \qt{am}
+%          \end{description}
+%        \item Otherwise
+%          \begin{description}
+%           \item Print the hour value less 12 
+%                 (\verb|\number\numexpr##1-12|)
+%           \item Print \qt{pm}
+%          \end{description}
+%       \end{description}
+%     \end{description}
+%   \end{description}
+% \end{description}
+%
+% \item Otherwise (minute value isn't zero)
+%
+% \begin{description}
+%  \item If the hour value is less than 13 (\verb|\ifnum##1<13|)
+%
+%  \begin{description}
+%   \item If the hour value is 0 (\verb|\ifnum##1=0|)
+%    \begin{description}
+%     \item Print \qt{12}
+%    \end{description}
+%   \item Otherwise
+%    \begin{description}
+%      \item Print the hour (\verb|\number##1|)
+%    \end{description}
+%
+%   \item Print the separator between the hour and minute
+%         (\verb|\DTMenglishtimesep|)
+%
+%   \item Print minute value (\verb|\DTMtwodigits{##2}|)
+%
+%   \item If the hour value is 12 (\verb|\ifnum##=12|)
+%    \begin{description}
+%      \item Print \qt{pm}
+%    \end{description}
+%   \item Otherwise (hour value less than 12)
+%    \begin{description}
+%      \item Print \qt{am}
+%    \end{description}
+%  \end{description}
+%
+%  \item Otherwise (hour value $\ge13$)
+%
+%  \begin{description}
+%   \item Print the hour value less 12 
+%         (\verb|\number\numexpr##1-12|)
+%   \item Print the time separator
+%
+%   \item Print minute value (\verb|\DTMtwodigits{##2}|)
+%
+%   \item If the hour value is 24 (\verb|\ifnum##1=24|)
+%   \begin{description}
+%    \item Print \qt{am}
+%   \end{description}
+%   \item Otherwise
+%   \begin{description}
+%    \item Print \qt{pm}
+%   \end{description}
+%  \end{description}
+% \end{description}
+%\end{description}
+%Most of the complication in this style isn't trying to determine the
+%equivalent value of \cs{THEHOURXII} (\verb|\number\numexpr##1-12|
+%if \verb|##1>12|) but in improving the algorithm to catch special
+%cases that the \styfmt{datetime} style misses.  Additionally,
+%\ics{DTMtexorpdfstring} is used to prevent any font formatting
+%commands from being added to the bookmarks.
+%
+%The \sty{datetime2-en-fulltext} package provides an example of a
+%time style that requires calculating the minutes to the hour and the
+%next hour. Note that fragile commands are protected in this style.
+%Since it contains fragile commands that require protection, it can't
+%be used in an expandable context.
+%
+%Remember that most of the styles provided by \styfmt{datetime2} and its
+%associated modules and dependent packages are configurable, so if
+%your preferred style is only marginally different to a predefined
+%style, you may be able to tweak that style to fit your requirements.
+%For example, the dot time format can be obtained using the
+%\style{default} style with the seconds suppressed and the separator
+%change to a dot:
+%\begin{verbatim}
+%\DTMsettimestyle{default}
+%\DTMsetup{timesep={.},showseconds=false}
+%\end{verbatim}
+%
+%The twelve hour format provided by the \module{english} module can also be 
+%adjusted. This style honours the package-wide time-related option
+%\pkgopt{hourminsep} and the \qt{am}, \qt{pm}, \qt{midnight} or
+%\qt{noon} part is formatted according to:
+%\begin{definition}[\inpkg{datetime2-english}]
+%\ics{DTMenglishampmfmt}\marg{text}
+%\end{definition}
+%
+%So a twelve hour format that uses a dot instead of a colon and has
+%the text part in small caps can be obtained using:
+%\begin{verbatim}
+%\usepackage[english,hourminsep={.}]{datetime2}
+%\renewcommand*{\DTMenglishampmfmt}[1]{\textsc{#1}}
+%\end{verbatim}
+%
+%\StopEventually{\PrintChanges\PrintIndex}
+%
+%
+%\chapter{The Code}
+%\iffalse
+%    \begin{macrocode}
+%<*datetime2.sty>
+%    \end{macrocode}
+%\fi
+%\section{datetime2.sty code}
+%\changes{1.0}{2015-03-24}{Initial release}
+%    \begin{macrocode}
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{datetime2}[2016/01/22 v1.3 (NLCT) date and time formats]
+%    \end{macrocode}
+% Use \sty{tracklang} to find out what languages have been loaded.
+%    \begin{macrocode}
+\RequirePackage{tracklang}
+%    \end{macrocode}
+% Also require \sty{etoolbox}.
+%    \begin{macrocode}
+\RequirePackage{etoolbox}
+%    \end{macrocode}
+% Need \sty{xkeyval} for \meta{key}=\meta{value} interface.
+%    \begin{macrocode}
+\RequirePackage{xkeyval}[2006/11/18]
+%    \end{macrocode}
+%
+%\begin{macro}{\dtm@yearmonthsep}
+% Separator between year and month for numeric dates.
+%    \begin{macrocode}
+\newcommand*{\dtm@yearmonthsep}{-}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@monthdaysep}
+% Separator between month and day for numeric dates.
+%    \begin{macrocode}
+\newcommand*{\dtm@monthdaysep}{-}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@dayyearsep}
+% Separator between day and year for numeric middle-endian dates.
+%    \begin{macrocode}
+\newcommand*{\dtm@dayyearsep}{-}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@hourminsep}
+% Separator between the hour and minute for times.
+%    \begin{macrocode}
+\newcommand*{\dtm@hourminsep}{:}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@minsecsep}
+% Separator between the minute and second for times.
+%    \begin{macrocode}
+\newcommand*{\dtm@minsecsep}{:}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@timezonesep}
+% Separator between the date and time.
+%    \begin{macrocode}
+\newcommand*{\dtm@datetimesep}{\space}%
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtm@timezonesep}
+% Separator between the time and time zone.
+%    \begin{macrocode}
+\newcommand*{\dtm@timezonesep}{}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{option}{datesep}
+% Set year/month and month/day separator.
+%    \begin{macrocode}
+\define@key{datetime2.sty}{datesep}{%
+  \renewcommand*{\dtm@yearmonthsep}{#1}%
+  \renewcommand*{\dtm@monthdaysep}{#1}%
+  \renewcommand*{\dtm@dayyearsep}{#1}%
+}
+%    \end{macrocode}
+%\end{option}
+%
+%\begin{option}{yearmonthsep}
+% Set year/month separator.
+%    \begin{macrocode}
+\define@key{datetime2.sty}{yearmonthsep}{%
+  \renewcommand*{\dtm@yearmonthsep}{#1}%
+}
+%    \end{macrocode}
+%\end{option}
 %
 %\begin{option}{monthdaysep}
 % Set month/day separator.
@@ -2546,10 +5803,22 @@
 % Pass any unknown options to \sty{tracklang}.
 % This will automatically switch the "useregional" setting to
 % \texttt{text}.
+%\changes{1.3}{2016-01-22}{added predefined dialect test}
 %    \begin{macrocode}
 \DeclareOptionX*{%
-  \TrackPredefinedDialect{\CurrentOption}%
-  \renewcommand*{\DTMifcaseregional}[3]{#2}%
+  \ifcsundef{@tracklang@add@\CurrentOption}%
+  {%
+    \PackageError{datetime2}{`\CurrentOption' is not a recognised dialect.
+    \MessageBreak Perhaps you have misspelt it or the 
+    \MessageBreak named dialect may be unsupported or
+    \MessageBreak perhaps you forgot to use the `style' key}%
+    {Any options that aren't described in the manual are assumed
+    \MessageBreak to be language or dialect names.}%
+  }%
+  {%
+    \TrackPredefinedDialect{\CurrentOption}%
+    \renewcommand*{\DTMifcaseregional}[3]{#2}%
+  }%
 }
 %    \end{macrocode}
 %
@@ -3988,6 +7257,62 @@
  }
 %    \end{macrocode}
 %
+% Define \style{ddmmyy} style:
+%\changes{1.3}{2016-01-22}{added ddmmyy style}
+%    \begin{macrocode}
+\DTMnewstyle
+ {ddmmyy}%label
+ {% date style
+    \renewcommand*\DTMdisplaydate[4]{%
+      \DTMtwodigits{##3}\DTMsep{monthday}%
+      \DTMtwodigits{##2}\DTMsep{yearmonth}%
+      \DTMtwodigits{##1}%
+    }%
+    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
+ }%
+ {% time style
+    \renewcommand*\DTMdisplaytime[3]{%
+      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
+      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
+    }%
+ }%
+ {% zone style
+   \renewcommand*{\DTMdisplayzone}[2]{%
+     \ifboolexpe
+     { bool{DTMshowisoZ}
+       and test{\ifnumequal{##1}{0}}
+       and test{\ifnumequal{##2}{0}}
+     }%
+     {%
+       Z%
+     }%
+     {%
+      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
+      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
+     }%
+   }%
+ }%
+ {% full style
+   \renewcommand*{\DTMdisplay}[9]{%
+    \ifDTMshowdate
+     \DTMdisplaydate{##1}{##2}{##3}{##4}%
+     \DTMsep{datetime}%
+    \fi
+    \DTMdisplaytime
+     {##5}%
+     {##6}%
+     {##7}%
+    \ifDTMshowzone
+     \DTMsep{timezone}%
+     \DTMdisplayzone
+      {##8}%
+      {##9}%
+    \fi
+   }%
+   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
+ }
+%    \end{macrocode}
+%
 % Define \style{mmddyyyy} style:
 %    \begin{macrocode}
 \DTMnewstyle
@@ -4106,10 +7431,66 @@
  {mdyy}%label
  {% date style
     \renewcommand*\DTMdisplaydate[4]{%
-      \number##2 % space intended
-      \DTMsep{monthday}%
-      \number##3 % space intended
-      \DTMsep{dayyear}%
+      \number##2 % space intended
+      \DTMsep{monthday}%
+      \number##3 % space intended
+      \DTMsep{dayyear}%
+      \DTMtwodigits{##1}%
+    }%
+    \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
+ }%
+ {% time style
+    \renewcommand*\DTMdisplaytime[3]{%
+      \DTMtwodigits{##1}\DTMsep{hourmin}\DTMtwodigits{##2}%
+      \ifDTMshowseconds\DTMsep{minsec}\DTMtwodigits{##3}\fi
+    }%
+ }%
+ {% zone style
+   \renewcommand*{\DTMdisplayzone}[2]{%
+     \ifboolexpe
+     { bool{DTMshowisoZ}
+       and test{\ifnumequal{##1}{0}}
+       and test{\ifnumequal{##2}{0}}
+     }%
+     {%
+       Z%
+     }%
+     {%
+      \ifnum##1<0\else+\fi\DTMtwodigits{##1}%
+      \ifDTMshowzoneminutes\DTMsep{hourmin}\DTMtwodigits{##2}\fi
+     }%
+   }%
+ }%
+ {% full style
+   \renewcommand*{\DTMdisplay}[9]{%
+    \ifDTMshowdate
+     \DTMdisplaydate{##1}{##2}{##3}{##4}%
+     \DTMsep{datetime}%
+    \fi
+    \DTMdisplaytime
+     {##5}%
+     {##6}%
+     {##7}%
+    \ifDTMshowzone
+     \DTMsep{timezone}%
+     \DTMdisplayzone
+      {##8}%
+      {##9}%
+    \fi
+   }%
+   \renewcommand*{\DTMDisplay}{\DTMdisplay}%
+ }
+%    \end{macrocode}
+%
+% Define \style{mmddyy} style:
+%\changes{1.3}{2016-01-22}{added mmddyy style}
+%    \begin{macrocode}
+\DTMnewstyle
+ {mmddyy}%label
+ {% date style
+    \renewcommand*\DTMdisplaydate[4]{%
+      \DTMtwodigits{##2}\DTMsep{monthday}%
+      \DTMtwodigits{##3}\DTMsep{dayyear}%
       \DTMtwodigits{##1}%
     }%
     \renewcommand*{\DTMDisplaydate}{\DTMdisplaydate}%
@@ -4596,13 +7977,63 @@
      {%
        \edef\@dtm@loadedregions{\@dtm@loadedregions,#1}%
      }%
+%    \end{macrocode}
+% In case a synonym is also used, add a mapping from the module name
+% to the current tracked dialect.
+%\changes{1.3}{2016-01-22}{added module to dialect map}
+%    \begin{macrocode}
+     \csedef{@dtm@moddialectmap@#1}{\CurrentTrackedDialect}%
+   }%
+   {%
+%    \end{macrocode}
+% The module has already been loaded, but the current tracked
+% dialect might be a synonym for a different language label that
+% might've already loaded the module. If \cs{date\meta{dialect}}
+% exists, this needs to be set.
+%    \begin{macrocode}
+     \ifcsdef{date\CurrentTrackedDialect}
+     {%
+       \letcs{\@dtm@otherdialect}{@dtm@moddialectmap@#1}%
+       \edef\@dtm@thisdialect{\CurrentTrackedDialect}%
+       \ifdefequal\@dtm@thisdialect\@dtm@otherdialect
+       {}%
+       {%
+         \ifcsdef{date\@dtm@otherdialect}%
+         {%
+           \csletcs{date\@dtm@thisdialect}{date\@dtm@otherdialect}%
+         }%
+         {}%
+       }%
+     }%
+     {}%
    }%
-   {}%
+%    \end{macrocode}
+% In case it's needed, create a mapping between the dialect name and
+% the module name.
+%\changes{1.3}{2016-01-22}{added dialect to module map}
+%    \begin{macrocode}
+   \csedef{@dtm@dialectmodmap@\CurrentTrackedDialect}{#1}%
  }%
 }
 %    \end{macrocode}
 %\end{macro}
 %
+%\begin{macro}{\DTMdialecttomodulemap}
+%\changes{1.3}{2016-01-22}{new}
+%\begin{definition}
+%\cs{DTMdialecttomodulemap}\marg{dialect}
+%\end{definition}
+% Expands to name of the module loaded with the given dialect name
+% or \cs{relax} if no module has been loaded for the given dialect.
+%    \begin{macrocode}
+\newcommand*{\DTMdialecttomodulemap}[1]{%
+ \ifcsdef{ver@datetime2-#1.ldf}%
+ {#1}%
+ {\csname @dtm@dialectmodmap@#1\endcsname}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
 %\begin{macro}{\ProvidesDateTimeModule}
 % For use in language module to identify itself.
 %    \begin{macrocode}
@@ -4612,6 +8043,25 @@
 %    \end{macrocode}
 %\end{macro}
 %
+%\begin{macro}{\DTMusemodule}
+%\changes{1.03}{2016-01-20}{new}
+% Provided for packages or documents that need to load a module.
+% This shouldn't be used inside the \texttt{.ldf} files.
+%    \begin{macrocode}
+\newcommand*{\DTMusemodule}[2]{%
+ \ifcsdef{@tracklang@add@#1}%
+ {%
+   \TrackPredefinedDialect{#1}%
+ }%
+ {}%
+ \let\@dtm@org@dialect\CurrentTrackedDialect
+ \def\CurrentTrackedDialect{#1}%
+ \RequireDateTimeModule{#2}%
+ \let\CurrentTrackedDialect\@dtm@org@dialect
+}
+%    \end{macrocode}
+%\end{macro}
+%
 %\begin{macro}{\DTMdefkey}
 %\begin{definition}
 %\cs{DTMdefkey}\marg{region}\marg{key}\oarg{default}\marg{func}
@@ -4669,8 +8119,15 @@
 % iterated over. (I'm not sure why \cs{setkeys} doesn't work
 % if the same key is present in multiple families, so this iterates
 % over the families instead.)
+% The starred version doesn't warn on unknown keys.
+%\changes{1.3}{2016-01-22}{added starred version}
 %    \begin{macrocode}
-\newcommand*{\DTMlangsetup}[2][\@dtm@loadedregions]{%
+\newcommand*{\DTMlangsetup}{%
+  \@ifstar\s@DTMlangsetup\@DTMlangsetup}
+%    \end{macrocode}
+% Unstarred version:
+%    \begin{macrocode}
+\newcommand*{\@DTMlangsetup}[2][\@dtm@loadedregions]{%
  \@for\@dtm@region:=#1\do{%
    \setkeys*+[dtm]{\@dtm@region}{#2}%
    \ifdefempty\XKV@rm{}%
@@ -4683,6 +8140,15 @@
  }%
 }
 %    \end{macrocode}
+%
+% Starred version:
+%    \begin{macrocode}
+\newcommand*{\s@DTMlangsetup}[2][\@dtm@loadedregions]{%
+ \@for\@dtm@region:=#1\do{%
+   \setkeys*+[dtm]{\@dtm@region}{#2}%
+ }%
+}
+%    \end{macrocode}
 %\end{macro}
 %
 % Now load all the required modules (if installed) using the
@@ -4726,7 +8192,7 @@
 %\section{datetime2-calc.sty code}
 %    \begin{macrocode}
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{datetime2-calc}[2015/11/10 v1.2 (NLCT)]
+\ProvidesPackage{datetime2-calc}[2016/01/22 v1.3 (NLCT)]
 %    \end{macrocode}
 % Load other required packages
 %    \begin{macrocode}
@@ -4734,6 +8200,7 @@
 \RequirePackage{pgfcalendar}
 %    \end{macrocode}
 %
+%\subsection{Conversions and Calculations}
 %\begin{macro}{\@dtm@julianday}
 % Register for storing Julian day number.
 %    \begin{macrocode}
@@ -5026,6 +8493,530 @@
 }
 %    \end{macrocode}
 %\end{macro}
+%
+%\subsection{Month and Weekday Names}
+%These commands \emph{should not} be used in date styles. One of the
+%reasons for replacing \sty{datetime} with \sty{datetime2} was
+%caused by styles using language-variable names in language-specific
+%syntax resulting in a mismatch with the syntax of one language (or
+%region) with a translation of the month (and possibly weekday) name.
+%These commands are provided for standalone use outside of styles.
+%(Additionally, they're not expandable, which also makes them
+%inappropriate for the styles that are expected to provide
+%expandable dates.)
+%
+%\begin{macro}{\dtm@ifdianameexists}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newcommand*{\dtm@ifdianameexists}[3]{%
+ \IfTrackedDialect{\languagename}%
+ {%
+   \ifcsdef{DTM\TrackedLanguageFromDialect{\languagename}#1}%
+   {#2}%
+   {#3}%
+ }%
+ {#3}%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMmonthname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMmonthname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}monthname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename monthname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename monthname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{monthname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}monthname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This may be because the
+% actual name can't be determined or it could be because the
+% relevant language module can't be loaded so use \sty{pgf}'s
+% command instead, which also has limited language support.
+%    \begin{macrocode}
+      \dtmnamewarning{\DTMmonthname}%
+      \pgfcalendarmonthname{#1}%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMMonthname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMMonthname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}Monthname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename Monthname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename Monthname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{Monthname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}Monthname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This could be because
+% there's no upper case macro as the names always start with a
+% capital (like English).
+%    \begin{macrocode}
+      \ifcsdef{DTM\languagename monthname}%
+      {%
+        \csuse{DTM\languagename monthname}{#1}%
+      }%
+      {%
+        \dtm@ifdianameexists{monthname}%
+        {%
+          \csuse{DTM\TrackedLanguageFromDialect{\languagename}monthname}{#1}%
+        }%
+        {%
+%    \end{macrocode}
+% Can't find no-case change version either, so use \sty{pgfcalendar}
+% command instead (which will need a case-change applied).
+%    \begin{macrocode}
+          \dtmnamewarning{\DTMMonthname}%
+%    \end{macrocode}
+% If \sty{mfirstuc} has been loaded, use it.
+%    \begin{macrocode}
+          \ifdef\emakefirstuc
+          {%
+           \emakefirstuc{\pgfcalendarmonthname{#1}}%
+          }%
+          {%
+%    \end{macrocode}
+% Hasn't been loaded, so just expand and apply \cs{MakeUppercase}:
+%    \begin{macrocode}
+            \protected@edef\dtm@tmp@monthname{\pgfcalendarmonthname{#1}}%
+            \expandafter\MakeUppercase\dtm@tmp@monthname
+          }%
+        }%
+      }%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMshortmonthname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMshortmonthname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}shortmonthname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename shortmonthname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename shortmonthname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{shortmonthname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortmonthname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This may be because the
+% actual name can't be determined or it could be because the
+% relevant language module can't be loaded so use \sty{pgf}'s
+% command instead, which also has limited language support.
+%    \begin{macrocode}
+      \dtmnamewarning{\DTMshortmonthname}%
+      \pgfcalendarmonthshortname{#1}%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMshortMonthname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMshortMonthname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}shortMonthname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename shortMonthname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename shortMonthname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{shortMonthname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortMonthname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This could be because
+% there's no upper case macro as the names always start with a
+% capital (like English).
+%    \begin{macrocode}
+      \ifcsdef{DTM\languagename shortmonthname}%
+      {%
+        \csuse{DTM\languagename shortmonthname}{#1}%
+      }%
+      {%
+        \dtm@ifdianameexists{shortmonthname}%
+        {%
+           \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortmonthname}%
+           {#1}%
+        }%
+        {%
+%    \end{macrocode}
+% Can't find no-case change version either, so use \sty{pgfcalendar}
+% command instead (which will need a case-change applied).
+%    \begin{macrocode}
+          \dtmnamewarning{\DTMshortMonthname}%
+%    \end{macrocode}
+% If \sty{mfirstuc} has been loaded, use it.
+%    \begin{macrocode}
+          \ifdef\emakefirstuc
+          {%
+           \emakefirstuc{\pgfcalendarmonthshortname{#1}}%
+          }%
+          {%
+%    \end{macrocode}
+% Hasn't been loaded, so just expand and apply \cs{MakeUppercase}:
+%    \begin{macrocode}
+            \protected@edef\dtm@tmp@monthname{\pgfcalendarmonthshortname{#1}}%
+            \expandafter\MakeUppercase\dtm@tmp@monthname
+          }%
+        }%
+      }%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMweekdayname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMweekdayname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}weekdayname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename weekdayname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename weekdayname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{weekdayname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}weekdayname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This may be because the
+% actual name can't be determined or it could be because the
+% relevant language module can't be loaded so use \sty{pgf}'s
+% command instead, which also has limited language support.
+%    \begin{macrocode}
+      \dtmnamewarning{\DTMweekdayname}%
+      \pgfcalendarweekdayname{#1}%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMWeekdayname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMWeekdayname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}Weekdayname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename Weekdayname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename Weekdayname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{Weekdayname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}Weekdayname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This could be because
+% there's no upper case macro as the names always start with a
+% capital (like English).
+%    \begin{macrocode}
+      \ifcsdef{DTM\languagename weekdayname}%
+      {%
+        \csuse{DTM\languagename weekdayname}{#1}%
+      }%
+      {%
+        \dtm@ifdianameexists{weekdayname}%
+        {%
+           \csuse{DTM\TrackedLanguageFromDialect{\languagename}weekdayname}{#1}%
+        }%
+        {%
+%    \end{macrocode}
+% Can't find no-case change version either, so use \sty{pgfcalendar}
+% command instead (which will need a case-change applied).
+%    \begin{macrocode}
+          \dtmnamewarning{\DTMWeekdayname}%
+%    \end{macrocode}
+% If \sty{mfirstuc} has been loaded, use it.
+%    \begin{macrocode}
+          \ifdef\emakefirstuc
+          {%
+           \emakefirstuc{\pgfcalendarweekdayname{#1}}%
+          }%
+          {%
+%    \end{macrocode}
+% Hasn't been loaded, so just expand and apply \cs{MakeUppercase}:
+%    \begin{macrocode}
+            \protected@edef\dtm@tmp@weekdayname{\pgfcalendarweekdayname{#1}}%
+            \expandafter\MakeUppercase\dtm@tmp@weekdayname
+          }%
+        }%
+      }%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMshortweekdayname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMshortweekdayname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}shortweekdayname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename shortweekdayname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename shortweekdayname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{shortweekdayname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortweekdayname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This may be because the
+% actual name can't be determined or it could be because the
+% relevant language module can't be loaded so use \sty{pgf}'s
+% command instead, which also has limited language support.
+%    \begin{macrocode}
+      \dtmnamewarning{\DTMshortweekdayname}%
+      \pgfcalendarweekdayshortname{#1}%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMshortWeekdayname}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMshortWeekdayname}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}shortWeekdayname} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename shortWeekdayname}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename shortWeekdayname}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{shortWeekdayname}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortWeekdayname}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This could be because
+% there's no upper case macro as the names always start with a
+% capital (like English).
+%    \begin{macrocode}
+      \ifcsdef{DTM\languagename shortweekdayname}%
+      {%
+        \csuse{DTM\languagename shortweekdayname}{#1}%
+      }%
+      {%
+        \dtm@ifdianameexists{shortweekdayname}%
+        {%
+           \csuse{DTM\TrackedLanguageFromDialect{\languagename}shortweekdayname}%
+           {#1}%
+        }%
+        {%
+%    \end{macrocode}
+% Can't find no-case change version either, so use \sty{pgfcalendar}
+% command instead (which will need a case-change applied).
+%    \begin{macrocode}
+          \dtmnamewarning{\DTMshortWeekdayname}%
+%    \end{macrocode}
+% If \sty{mfirstuc} has been loaded, use it.
+%    \begin{macrocode}
+          \ifdef\emakefirstuc
+          {%
+           \emakefirstuc{\pgfcalendarweekdayshortname{#1}}%
+          }%
+          {%
+%    \end{macrocode}
+% Hasn't been loaded, so just expand and apply \cs{MakeUppercase}:
+%    \begin{macrocode}
+            \protected@edef\dtm@tmp@weekdayname{%
+              \pgfcalendarweekdayshortname{#1}}%
+            \expandafter\MakeUppercase\dtm@tmp@weekdayname
+          }%
+        }%
+      }%
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\DTMordinal}
+%\changes{1.3}{2016-01-22}{new}
+%    \begin{macrocode}
+\newrobustcmd{\DTMordinal}[1]{%
+%    \end{macrocode}
+% First check if \cs{DTM\meta{language}ordinal} exists.
+%    \begin{macrocode}
+  \ifcsdef{DTM\languagename ordinal}%
+  {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+    \csuse{DTM\languagename ordinal}{#1}%
+  }%
+  {%
+%    \end{macrocode}
+% Try obtaining the language name from the dialect using
+% \sty{tracklang}'s interface.
+%    \begin{macrocode}
+    \dtm@ifdianameexists{ordinal}%
+    {%
+%    \end{macrocode}
+% It exists, so use it.
+%    \begin{macrocode}
+       \csuse{DTM\TrackedLanguageFromDialect{\languagename}ordinal}{#1}%
+    }%
+    {%
+%    \end{macrocode}
+% Can't determine the language name macro. This may be because the
+% actual name can't be determined or it could be because the
+% relevant language module can't be loaded so just display the
+% number.
+%    \begin{macrocode}
+      \number#1
+    }%
+  }%
+}
+%    \end{macrocode}
+%\end{macro}
+%
+%\begin{macro}{\dtmnamewarning}
+%\changes{1.3}{2016-01-22}{new}
+% Issue warning unless warnings have been suppressed.
+%    \begin{macrocode}
+\newcommand*{\dtmnamewarning}[1]{%
+ \if@dtm@warn
+  \PackageWarning{datetime2-calc}%
+  {Can't find underlying language macro for \MessageBreak
+   \string#1\space(language: \languagename); \MessageBreak
+    using pgfcalendar macro instead}%
+ \fi
+}
+%    \end{macrocode}
+%\end{macro}
 %\iffalse
 %    \begin{macrocode}
 %</datetime2-calc.sty>
-- 
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