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+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Advance Date Package for LaTeX2e                                       %%
+%% (C) Z. Wagner -- Ice Bear Soft, 20 Oct 1996, <wagner@mbox.cesnet.cz>   %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Copyright 1996 Zdenek Wagner                                           %%
+%%                                                                        %%
+%% This work may be distributed and/or modified under the                 %%
+%% conditions of the LaTeX Project Public License, either version 1.3     %%
+%% of this license or (at your option) any later version.                 %%
+%% The latest version of this license is in                               %%
+%%   http://www.latex-project.org/lppl.txt                                %%
+%% and version 1.3 or later is part of all distributions of LaTeX         %%
+%% version 2005/12/01 or later.                                           %%
+%%                                                                        %%
+%% This work has the LPPL maintenance status `maintained'.                %%
+%%                                                                        %%
+%% The Current Maintainer of this work is Zdenek Wagner.                  %%
+%%                                                                        %%
+%% This work consists of all files listed in manifest.txt.                %%
+%%                                                                        %%
+%% This licence information was added 2010/11/22 by                       %%
+%% Clea F. Rees with the permission of Zdenek Wagner.                     %%
+%%                                                                        %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% This package contains macros which can add specified number of days    %%
+%% to the current date (as specified in \today) and print it. Some other  %%
+%% macros are also provided. It is intended for use e.g. in invoices      %%
+%% payable within 14 days from today etc.                                 %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% Macros with one default argument [in square brackets]                  %%
+%% \AdvanceDate   Default: [1]                                            %%
+%%      Advances date the specified number of days and sets the result    %%
+%%      to \today                                                         %%
+%% \DayAfter      Default: [1]                                            %%
+%%      Advances date by call to \AdvanceDate, prints \today and restores %%
+%%      the oroginal value of \today                                      %%
+%% \SaveDate      Default: [\s@v@dT@d@y]                                  %%
+%%      Saves \today into the specified macro                             %%
+%% \SetDate       Default: [\s@v@dT@d@y]                                  %%
+%%      Sets the date stored in \today. The argument must be in form:     %%
+%%      [dd/mm/yyyy] and may be present in a macro because the argument   %%
+%%      is always expanded before use. The value saved by \SaveDate can   %%
+%%      be used here.                                                     %%
+%%                                                                        %%
+%% Macros with one mandatory argument                                     %%
+%% \ThisDay     sets \day                                                 %%
+%% \ThisMonth   sets \month                                               %%
+%% \ThisYear    sets \year                                                %%
+%% \AdvMonth    advances \month and fixes it                              %%
+%% \AdvYear     advances \year                                            %%
+%%                                                                        %%
+%% Macros without arguments                                               %%
+%% \FixMonth    fixes \today so that 0 < \month < 13                      %%
+%% \FixDate     fixes \today so that it is valid                          %%
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{advdate}[1996/10/20 Advance Date Package]
+
+% KH code
+
+\newcount\r@k  \newcount\un@r
+\newcount\m@l  \m@l31
+\newcount\m@s  \m@s30
+\newcount\M@s
+
+\newcommand\is@LeapYear[1][\year]{\r@k#1\un@r\r@k
+  \divide\r@k4\multiply\r@k4\advance\r@k-\un@r
+  \ifnum\r@k=0%
+    \divide\un@r100\r@k\un@r\multiply\un@r100\advance\un@r-#1%
+    \ifnum\un@r=0%
+      \un@r\r@k \divide\un@r4\multiply\un@r4\advance\un@r-\r@k
+      \un@r\ifnum\un@r=0 29\else 28\fi
+    \else
+      \un@r 29%
+    \fi
+  \else
+    \un@r 28%
+  \fi
+  \r@k 337\advance\r@k\un@r}
+
+\newcommand\m@sic{\ifcase \month \or \m@l \or \un@r \or \m@l \or \m@s \or \m@l \or \m@s
+  \or \m@l \or \m@l \or \m@s \or \m@l \or \m@s \or \m@l \fi}
+
+\newcommand\FixMonth{%
+  \L@@p \ifnum\month<1 \advance\year\m@ne \advance\month12 \is@LeapYear \repeat
+  \L@@p \ifnum\month>12 \advance\year\@ne \advance\month-12 \is@LeapYear \repeat}
+
+\newcommand\FixDate{%
+  \FixMonth \is@LeapYear
+  \l@@p \ifnum\day<1 \Pr@vD@y \repeat
+  \l@@p \M@s\m@sic \ifnum\day>\M@s \N@xtD@y \repeat
+}
+
+% We need a nested \loop and the user might call the macros from his/her \loop
+
+\def\L@@p#1\repeat{\def\It@r@te{#1\relax \expandafter\It@r@te\fi}\It@r@te
+  \let\It@r@te\relax}
+
+\def\l@@p#1\repeat{\def\it@r@te{#1\relax \expandafter\it@r@te\fi}\it@r@te
+  \let\it@r@te\relax}
+
+\def\Pr@vD@y{%
+  \ifnum\day<-366
+    \ifnum\month>2
+      \advance\day\r@k \advance\year\m@ne \is@LeapYear
+    \else
+      \advance\year\m@ne \is@LeapYear \advance\day\r@k
+    \fi
+  \else
+    \advance\month\m@ne \FixMonth
+    \advance\day\m@sic
+  \fi}
+
+\def\N@xtD@y{%
+  \ifnum\day>366
+    \ifnum\month>2
+      \advance\year\@ne \is@LeapYear \advance\day-\r@k
+    \else
+      \advance\day-\r@k \advance\year\@ne \is@LeapYear
+    \fi
+  \else
+    \advance\day-\M@s \advance\month\@ne \FixMonth
+  \fi}
+
+\newcommand\AdvanceDate[1][\@ne]{\advance\day#1 \FixDate}
+
+\newcommand\DayAfter[1][\@ne]{{\AdvanceDate[#1]\today}}
+
+\newcommand\SaveDate[1][\s@v@dT@d@y]{%
+  \expandafter \expandafter \expandafter \expandafter
+  \expandafter \expandafter \expandafter \edef
+  \expandafter \expandafter \expandafter \expandafter
+  \expandafter \expandafter \expandafter #1\expandafter
+  \expandafter \expandafter \expandafter
+  \expandafter \expandafter \expandafter
+  {\expandafter \expandafter \expandafter \number
+    \expandafter \expandafter \expandafter \day
+    \expandafter \expandafter \expandafter /\expandafter \number
+    \expandafter \month \expandafter /\number \year}}
+
+\newcommand\SetDate[1][\s@v@dT@d@y]{\edef\d@t@{#1}%
+  \expandafter\t@d@y\d@t@\t@d@y\FixDate}
+
+\def\t@d@y#1/#2/#3\t@d@y{\day#1 \month#2 \year#3 \relax}
+
+\newcommand\ThisDay[1]{\day#1 \relax}
+\newcommand\ThisMonth[1]{\month#1 \relax}
+\newcommand\ThisYear[1]{\year#1 \relax}
+\newcommand\AdvMonth[1]{\advance\month#1 \FixMonth}
+\newcommand\AdvYear[1]{\advance\year#1 \relax}