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+%--------------------------------------------
+%
+% Package pgfplots, library for high-level coordinates.
+%
+% Copyright 2007/2008 by Christian Feuersänger.
+%
+% This program is free software: you can redistribute it and/or modify
+% it under the terms of the GNU General Public License as published by
+% the Free Software Foundation, either version 3 of the License, or
+% (at your option) any later version.
+%
+% This program is distributed in the hope that it will be useful,
+% but WITHOUT ANY WARRANTY; without even the implied warranty of
+% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+% GNU General Public License for more details.
+%
+% You should have received a copy of the GNU General Public License
+% along with this program. If not, see <http://www.gnu.org/licenses/>.
+%
+%--------------------------------------------
+
+\pgfutil@usemodule{pgfcalendar}
+
+% Idea: allow
+%--------------------------------------------------
+% \begin{tikzpicture}
+% \begin{axis}[
+% date coordinates in=x,
+% xticklabel={\day.\month.},
+% ]
+% \addplot coordinates {
+% (2008-01-5, 5)
+% (2008-01-12, 10)
+% (2008-01-16, 20)
+% };
+% \end{axis}
+% \end{tikzpicture}
+%--------------------------------------------------
+
+\def\pgfplots@truncate@to@julian#1.#2\pgfplots@EOI#3{#3=#1\relax}%
+
+\pgfplotsset{
+ /pgfplots/date ZERO/.code={%
+ \begingroup
+ \pgfcalendardatetojulian{#1}\c@pgf@counta
+ \edef\pgfmathresult{\the\c@pgf@counta}%
+ \pgfmath@smuggleone\pgfmathresult
+ \endgroup
+ \let\pgfplots@calender@ZEROSHIFT=\pgfmathresult
+ },
+ date ZERO=2006-01-01,
+ /pgfplots/date coordinates in/.style={
+ /pgfplots/#1 coord trafo/.code={%
+ \begingroup
+ \pgfcalendardatetojulian{##1}\c@pgf@counta
+ \advance\c@pgf@counta by-\pgfplots@calender@ZEROSHIFT\relax
+ \edef\pgfmathresult{\the\c@pgf@counta}%
+ \pgfmath@smuggleone\pgfmathresult
+ \endgroup
+ },
+ /pgfplots/#1 coord inv trafo/.code={%
+ \begingroup
+ \pgfplots@truncate@to@julian##1\pgfplots@EOI{\c@pgf@counta}%
+ \advance\c@pgf@counta by\pgfplots@calender@ZEROSHIFT\relax
+ \expandafter
+ \endgroup
+ \expandafter\pgfcalendarjuliantodate\expandafter{\the\c@pgf@counta}\year\month\day
+ \edef\pgfmathresult{\year-\month-\day}%
+ },
+ /pgfplots/#1ticklabel={\tick},%
+ /pgfplots/scaled #1 ticks=false,
+ },
+ /pgfplots/date coordinates in/.value required,
+}
+