redefine date format in letter environment

[Julius Müller]

Am 07.12.22 um 14:30 schrieb Haines Brown:
> I want today's date to appear: 2022.21.07 rather than 2022.21.7
>
> \documentclass[letterpaper,12pt]{letter}
>
> \usepackage{fontspec}
> \usepackage{libertinus-otf}
>
> \def\mydate{\leavevmode\hbox{\the\year.\twodigits\month.\twodigits\day}}
> \def\twodigits#1{\ifnum#1<10 0\fi\the#1}
> \renewcommand*\today{\number\year.\number\month.\number\day}

As Lars Madsen already pointed out, you need to use the \twodigits macro
within \today if you want the two digits form, for example by making use
of the \mydate macro you just defined:

\renewcommand*\today{\mydate}

>
> \begin{document}
> \begin{letter}{}
>
>    \opening{}
>
> \end{letter}
> \end{document}
>
>