On Mon, Dec 25, 2023 at 12:24:55AM +0000, Albretch Mueller wrote: > I am trying to use it in an > obvious human readable way right in the file names.
With that restriction, "always use UTC" is going to be your best path forward. It should be possible to convert a well-chosen human-readable time/date format in UTC to epoch time, and vice versa. How human-readable a UTC time/date string actually is will depend on the human, of course. But every other choice is going to be more difficult, or more error-prone, or both.
