[COFF] Manipulating time_t values (was: Unix half-billion years old 1985)

[Bakul Shah]

On Tue, 05 Nov 2019 10:00:55 +1100 Greg 'groggy' Lehey <grog at lemis.com> wrote:
>
> [Moved to COFF]
>
> On Monday,  4 November 2019 at 16:59:22 -0500, John P. Linderman wrote:
> > I wrote a near-trivial "timestamp" command to make it easier to do time
> > arithmetic
> >
> > TZ=udt timestamp
> > 119 11 04 21 50 06 18204 1572904206 Mon Nov  4 21:50:06 2019
> > TZ=udt timestamp 0
> > 70 01 01 00 00 00 0 0 Thu Jan  1 00:00:00 1970
> > ...
>
> FreeBSD has this functionality in date(1):
>
>  TZ=UTC date -r 500000000
>  Tue  5 Nov 1985 00:53:20 UTC
>  TZ=UTC date -r 1500000000
>  Fri 14 Jul 2017 02:40:00 UTC

Shouldn't that be 
    Tue  5 Nov 1985 00:52:57 UTC
    Fri 14 Jul 2017 02:39:23 UTC
given that this is UTC (which is 37 seconds behind TAI)?

Sorry :-)