On Friday, 31 Dec 2021 at 14:21, Uwe Brauer wrote:
> ⚠️ Caution: External sender
>
>
> Hi
>
> Does anybody know about a function that would convert between
> date format  like 31.12.2021 to  <2020-12-31> and back?

This is Emacs, of course, so you could use query-replace-regexp (M-%)
with, for instance

\([0-9][0-9]\)\.\([0-9][0-9]\)\.\([0-9]\{4\}\)

as the pattern to search for and

<\3-\2-\1>

as the replacement.  The converse is left as an exercise for the
reader. ;-)

-- 
: Eric S Fraga, with org release_9.5.2-289-gce75d2 in Emacs 29.0.50
: Latest paper written in org: https://arxiv.org/abs/2106.05096

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