datetime2 causes stack error

Question

Anyone able to explain why this is? Here's a mwe. If I comment out the two datetime2 lines, document compiles fine, otherwise failure occurs on \opening:

\documentclass[a4paper,
    margin=2cm,
    headlines=4,
    parskip=full]{scrartcl}
\usepackage[%
    foldmarks=false,
    fromalign=right,
    fromrule=off,
    refline=dateleft,
    fromphone=false,
    fromemail=true,
    pagenumber=footright,
    fromlogo=false]{scrletter}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[english]{babel}
%\usepackage{showframe}
\usepackage[en-GB]{datetime2}
\DTMlangsetup[en-GB]{ord=raise}
\begin{document}
\begin{letter}{%
        A. N. Other\
        Someplace\
        ZIP CODE%
    }
\opening{test}
\closing{cheers}
\end{letter}
\end{document}

EDIT:

log output

! TeX capacity exceeded, sorry [input stack size=5000].
\sym@date ->\if@orgdate \sym@date 
                                  \else \num@date \fi 
l.31         \opening{test}
If you really absolutely need more capacity,
you can ask a wizard to enlarge me.

Please add the complete error message to your question ... BTW: Welcome to TeX.SE! — Mensch, Feb 27 '22 at 19:14
I think the two packages are not compatible. scrletter redefines \today at begin document. So even if you avoid the error you actually don't get the datetime2 commands. — Ulrike Fischer, Feb 27 '22 at 20:11

score 1 · Answer 1 · answered Feb 27 '22 at 20:10

There seems to be two ways to avoid this error:

Add a global option british. (I noticed this because in the documentation of datetime2 there are plenty of \documentclass[british]{article}.)
Load babel after datetime2 (but this might not be a very good idea)

\documentclass[a4paper,
    margin=2cm,
    headlines=4,
    parskip=full,
    british,
    ]{scrartcl}
\usepackage[%
    foldmarks=false,
    fromalign=right,
    fromrule=off,
    refline=dateleft,
    fromphone=false,
    fromemail=true,
    pagenumber=footright,
    fromlogo=false]{scrletter}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
% \usepackage[en-GB]{datetime2}
% \DTMlangsetup[en-GB]{ord=raise}
\usepackage[english]{babel}
%\usepackage{showframe}
\usepackage[en-GB]{datetime2}
\DTMlangsetup[en-GB]{ord=raise}
\begin{document}
\begin{letter}{%
        A. N. Other\
        Someplace\
        ZIP CODE%
    }
\opening{test}
\closing{cheers}
\end{letter}
\end{document}

First way doesn't work. Only putting babel after datetime2 irrespective of whether global option 'british' is added, works. Why is loading babel after datetime2 not advisable? — Timmy, Feb 27 '22 at 20:37

datetime2 causes stack error

1 Answers1