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

[Greg 'groggy' Lehey]

[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

Greg
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