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Leave the ISO date format "%Y-%m-%d" alone.

The long date format is printed with month format string "%OBta". This
uses the 'standalone' month name (because musl only supports that)
combined with the '-ta' suffix which results in correct month declension
for all the month names. With this format both 'strftime(..., "%c", tm)'
in musl and g_date_time_format(dt, "%c")' in GLib print the date
and time in the correct format

Short dates use "." as separator (really an ordinal marker for days and
months).