Re: How to format this type of timestamp

[Eli Zaretskii]

> Date: Sun, 4 Oct 2020 07:28:34 +0300
> From: Jean Louis <bugs@gnu.support>
> Cc: help-gnu-emacs@gnu.org
> 
> > Where did you get the value 1599712637489?  What is its semantics?
> > The number of seconds since the epoch is several orders of magnitude
> > smaller.  E.g., this works:
> > 
> >   (format-time-string "%c" 1599712637.489)
> > 
> > where I divided the value you provided by 1000.
> 
> Thank you, that is what I also search, how did developer made that
> number. It is export of SMS from encrypted SMS application named
> Silence. Maybe I will get answer soon.

Perhaps that application reports time in millisecond units?