# AMSART: Including two dates

In amsart, how do you include two dates (in the footnotes)?

Specifically, another one (displayed after the label Last update) in addition to the default one (\date), with the same options.

\documentclass[10pt]{amsart}

\begin{document}
\title[Short Title]{Long Title}
\author[Surname]{Name Surname}
\email{email@email.com}
\date{14/09/2015}

\maketitle

\end{document}

• Please give us a minimal document which we can compile. We do not want to set up a whole example for you just in order to add a fixed date. – LaRiFaRi Sep 14 '15 at 8:50
• @LaRiFaRi : Upon a change of mind, I revised the question. I hope it is not a problem. – user87695 Sep 14 '15 at 9:04
• Would this trick be enough for you? \date{September 14, 2015; \textit{Last updated}:~\today}. This needs no further patching of your class and the package amsaddr – LaRiFaRi Sep 14 '15 at 9:28
• @LaRiFaRi Actually, yes, thank you: it would serve my purpose well. However, I'd like to learn how to set up a second date too (it's always useful to learn something new after all). – user87695 Sep 14 '15 at 9:30

You can add some infrastructure to amsart.cls:

\documentclass[10pt]{amsart}

\makeatletter
\def\@setdate{%
\datename\ \@date
\ifx\last@update\@empty\else
.\ \lastupdatename\ \last@update
\fi
}
\def\lastupdatename{\textit{Last Update}:}
\def\lastupdate#1{\gdef\last@update{#1}}
\let\last@update\@empty
\makeatother

\begin{document}
\title[Short Title]{Long Title}
\author[Surname]{Name Surname}
\email{email@email.com}
\date{14/09/2015}
\lastupdate{\today}

\maketitle

\end{document}


• Is it possible to add \vspace{1mm} between the email address and the two dates? (I tried, but it doesn't seem to work.) – user87695 Sep 14 '15 at 10:13
• @Ryo Yes, but you need to modify the redefinition of \@maketitle made by amsaddr.sty. I see no improvement, though. Of course, the journal which you submit the paper to will reject these changes anyway. – egreg Sep 14 '15 at 10:15
• I see. And how do you do that? – user87695 Sep 14 '15 at 10:16
• @Ryo Ask a new question; but this is quite complicated, because other bits of information could follow the email address and the date could not be set. And, as I said, I see no real improvement in the output. – egreg Sep 14 '15 at 10:18
• By the way, could you have a look at this other (somewhat related) issue? – user87695 Sep 14 '15 at 10:27