Feature Tracker

ID	43🔗
Date:	2016-11-16 10:35:29
Status	Open Sign in if you want to like this report.
Category	datetime2
Summary	saved date conditionals

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Description

<a> and <b> are two saved dates.

\DTMsavedifdiffdate{<a>}{<b>}{<if a!=b>}{<if a==b>}
\DTMsavedifnewerdate{<a>}{<b>}{<if a newer than b>}{<if a not newer than b>}

Here is the code (it is easy to add ifdifftime or ifdiffdatetime) :

\newcommand*\dtm@save@ifop[5]{{
  \let\@tempa\@gobbletwo
  \ifcsundef{@dtm@#4@year}%
  {%
    \PackageError{datetime2}{Undefined date-time `#4'}{}%
  }{%
    \ifcsundef{@dtm@#5@year}%
    {%
      \PackageError{datetime2}{Undefined date-time `#5'}{}%
    }{%
      \def\@tempb##1,{%
         \def\@tempc{##1}%
         \ifx\@tempc\@nnil
           \let\@tempa\@secondoftwo
           \let\@tempb\@empty
         \else
           #1\ifnum\csname @dtm@#4@##1\endcsname#2\csname @dtm@#5@##1\endcsname
             \let\@tempa\@firstoftwo
             \def\@tempb####1\@nil,{}%
           \fi
         \fi
         \@tempb
      }
      \@tempb#3,\@nil,%
    }
  }
  \expandafter}\@tempa
}
\newcommand*\DTMsavedifdiffdate{%
   \dtm@save@ifop\unless={year,month,day}}
\newcommand*\DTMsavedifnewerdate{%
   \dtm@save@ifop\@empty>{year,month,day}}

MWE

No mwe.tex

Evaluation

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