format_timestamp

%1$02d.%2$02d.%3$02d %4$s
Format used to display a full date followed by a time.

%1$02d – day of month
%2$02d – month
%3$02d – year (decade)
%4$s – time (see format_time)

Example: 01.05.14 12:02 PM

Used, for example, when copying multiple messages.
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%1$02d.%2$02d.%3$02d %4$s
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Fair Dog, Aug 1, 2018 at 17:24