From mboxrd@z Thu Jan  1 00:00:00 1970
From: bakul at bitblocks.com (Bakul Shah)
Date: Mon, 04 Nov 2019 15:50:18 -0800
Subject: [COFF] Manipulating time_t values (was: Unix half-billion years
 old 1985)
In-Reply-To: Your message of "Tue, 05 Nov 2019 10:00:55 +1100."
 <20191104230055.GH68439@eureka.lemis.com>
References: <alpine.BSF.2.21.9999.1911050805570.11612@aneurin.horsfall.org>
 <alpine.BSF.2.21.9999.1911050809230.11612@aneurin.horsfall.org>
 <CAC0cEp_WX_aXRWnHcat8ZYbdvf8aeudGoU_SA2+Nj0Nc7v9sKA@mail.gmail.com>
 <20191104230055.GH68439@eureka.lemis.com>
Message-ID: <20191104235025.C0548156E80B@mail.bitblocks.com>

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 :-)