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Re: difference in seconds between two formatted dates ...

From David Wright <deblis@lionunicorn.co.uk>
Newsgroups linux.debian.user
Subject Re: difference in seconds between two formatted dates ...
Date 2023-12-18 07:00 +0100
Message-ID <HMePv-elIB-1@gated-at.bofh.it> (permalink)
References (3 earlier) <HM1fz-edF7-1@gated-at.bofh.it> <HM2lj-eei1-3@gated-at.bofh.it> <HM8qJ-ei2D-3@gated-at.bofh.it> <HM9PP-eiIQ-5@gated-at.bofh.it> <HMasx-ejar-1@gated-at.bofh.it>
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On Mon 18 Dec 2023 at 01:11:26 (+0000), Albretch Mueller wrote:
> On 12/18/23, David Wright <deblis@lionunicorn.co.uk> wrote:
> > When you write   dt00=$(date +%Y%m%d%H%M%S)
> > that's /your/ format, not coreutils'.
> 
>  I (erroneously?) thought coreutils was maintaining Linux date, so if
> they tell you on their --help instructions to use certain options
> (including cobbling them together to your heart's content) and you are
> telling them you are using their format and how, they should be able
> to parse that string.

You can prettyprint a timedate with date any way you care to, but
scanning a timedate with --date requires care. It's safest if you
give it a string in one of its own built-in formats. You appear
to be expecting your second date command to somehow guess the format
you used in the first command, which obviously can't happen.

Another problem in what you posted is that you sometimes run date
in your local timezone (generally for the "now" times), but you
append +00:00 as the timezone for those --date strings that you
construct from several substrings. You need to use UT throughout.

> ANyway, my hack around it wasn't effortful at
> all.

I don't know whether you're referring to something already posted,
or some new script written in the wake of what you've read here.

Cheers,
David.

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Thread

difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-17 11:20 +0100
  Re: difference in seconds between two formatted dates ... Andy Smith <andy@strugglers.net> - 2023-12-17 12:00 +0100
    Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-17 12:10 +0100
      Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-17 16:30 +0100
        Re: difference in seconds between two formatted dates ... "Andrew M.A. Cater" <amacater@einval.com> - 2023-12-17 17:00 +0100
        Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-17 17:10 +0100
        Re: difference in seconds between two formatted dates ... Andy Smith <andy@strugglers.net> - 2023-12-17 17:40 +0100
          Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-17 23:50 +0100
          Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-18 00:10 +0100
            Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-18 01:40 +0100
              Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-18 02:20 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-18 07:00 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-18 07:10 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-18 13:20 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-18 14:10 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-18 14:20 +0100
                date can't parse its own output was: difference in seconds between  two formatted dates ...) <tomas@tuxteam.de> - 2023-12-18 14:40 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-18 19:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-18 20:20 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-20 07:10 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-20 08:40 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-21 06:00 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-21 06:40 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-22 02:30 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-21 13:20 +0100
                RTC and (old) Windows [was: difference in seconds between two  formatted dates ...] <tomas@tuxteam.de> - 2023-12-21 13:30 +0100
                Re: RTC and (old) Windows [was: difference in seconds between two  formatted dates ...] David Christensen <dpchrist@holgerdanske.com> - 2023-12-21 23:30 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-22 02:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-22 04:10 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-20 08:50 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-20 13:20 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-20 13:40 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-20 14:20 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-20 14:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-20 16:10 +0100
                Re: difference in seconds between two formatted dates ... Nicolas George <george@nsup.org> - 2023-12-20 16:30 +0100
                systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) Max Nikulin <manikulin@gmail.com> - 2023-12-21 04:50 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) <tomas@tuxteam.de> - 2023-12-21 07:00 +0100
                Re: systemd and timezone Max Nikulin <manikulin@gmail.com> - 2023-12-21 17:10 +0100
                Re: systemd and timezone Nicholas Geovanis <nickgeovanis@gmail.com> - 2023-12-22 02:00 +0100
                Re: systemd and timezone Andy Smith <andy@strugglers.net> - 2023-12-22 13:50 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) Jeffrey Walton <noloader@gmail.com> - 2023-12-21 17:30 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) tomas@tuxteam.de - 2023-12-21 18:40 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) Dan Ritter <dsr@randomstring.org> - 2023-12-21 15:30 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) <tomas@tuxteam.de> - 2023-12-21 16:10 +0100
                Re: systemd and timezone (was: Re: difference in seconds between two  formatted dates ...) Nicolas George <george@nsup.org> - 2023-12-21 23:00 +0100
                Re: systemd and timezone gene heskett <gheskett@shentel.net> - 2023-12-22 01:00 +0100
                Re: systemd and timezone Max Nikulin <manikulin@gmail.com> - 2023-12-22 13:50 +0100
                Re: systemd and timezone <tomas@tuxteam.de> - 2023-12-22 14:40 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-22 15:20 +0100
                Re: systemd and timezone David Wright <deblis@lionunicorn.co.uk> - 2023-12-22 16:50 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-22 17:30 +0100
                Re: systemd and timezone "Arno Lehmann, ITS" <al@its-lehmann.de> - 2023-12-22 20:20 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-22 21:00 +0100
                Re: systemd and timezone David Wright <deblis@lionunicorn.co.uk> - 2023-12-22 20:50 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-22 21:20 +0100
                Re: systemd and timezone David Wright <deblis@lionunicorn.co.uk> - 2023-12-23 07:20 +0100
                Re: systemd and timezone Sven Joachim <svenjoac@gmx.de> - 2023-12-22 21:20 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-22 22:40 +0100
                Re: systemd and timezone David Wright <deblis@lionunicorn.co.uk> - 2023-12-23 00:30 +0100
                Re: systemd and timezone Pocket <pocket@columbus.rr.com> - 2023-12-23 00:50 +0100
                Re: systemd and timezone Pocket <pocket@columbus.rr.com> - 2023-12-23 01:10 +0100
                Re: systemd and timezone David Wright <deblis@lionunicorn.co.uk> - 2023-12-23 07:20 +0100
                Re: Support for SysV service scripts deprecated in systemd 255 (was:  systemd and timezone) Felix Miata <mrmazda@earthlink.net> - 2023-12-23 08:10 +0100
                Re: systemd and timezone Pocket <pocket@columbus.rr.com> - 2023-12-23 12:10 +0100
                Re: systemd and timezone Nate Bargmann <n0nb@n0nb.us> - 2023-12-23 02:00 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2023-12-23 02:20 +0100
                Re: systemd and timezone <tomas@tuxteam.de> - 2023-12-22 17:10 +0100
                Re: systemd and timezone Jeffrey Walton <noloader@gmail.com> - 2023-12-22 21:00 +0100
                Re: systemd and timezone Nicolas George <george@nsup.org> - 2023-12-22 23:40 +0100
                Re: systemd and timezone Charles Kroeger <mbone@gmx.co.uk> - 2024-01-06 03:30 +0100
                Re: systemd and timezone Greg Wooledge <greg@wooledge.org> - 2024-01-06 05:30 +0100
                Re: systemd and timezone gene heskett <gheskett@shentel.net> - 2024-01-06 06:40 +0100
                tzdata-legacy [was: Re: systemd and timezone] Max Nikulin <manikulin@gmail.com> - 2024-01-06 07:20 +0100
                Re: tzdata-legacy [was: Re: systemd and timezone] Max Nikulin <manikulin@gmail.com> - 2024-01-06 08:10 +0100
                Re: tzdata-legacy [was: Re: systemd and timezone] Nate Bargmann <n0nb@n0nb.us> - 2024-01-06 10:20 +0100
                Re: tzdata-legacy [was: Re: systemd and timezone] gene heskett <gheskett@shentel.net> - 2024-01-06 13:10 +0100
                Re: tzdata-legacy [was: Re: systemd and timezone] Greg Wooledge <greg@wooledge.org> - 2024-01-06 16:10 +0100
                Re: tzdata-legacy [was: Re: systemd and timezone] David Wright <deblis@lionunicorn.co.uk> - 2024-01-07 18:30 +0100
                was: Re: tzdata-legacy [was: Re: systemd and timezone] gene heskett <gheskett@shentel.net> - 2024-01-06 13:00 +0100
                Re: was: Re: tzdata-legacy [was: Re: systemd and timezone] John Hasler <john@sugarbit.com> - 2024-01-06 15:30 +0100
                SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re: systemd and  timezone] gene heskett <gheskett@shentel.net> - 2024-01-06 20:10 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re: systemd  and timezone] John Hasler <john@sugarbit.com> - 2024-01-06 20:40 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re: systemdand  timezone] gene heskett <gheskett@shentel.net> - 2024-01-06 21:40 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re: systemdand  timezone] Nate Bargmann <n0nb@n0nb.us> - 2024-01-06 23:10 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re: systemdand  timezone] Greg Wooledge <greg@wooledge.org> - 2024-01-07 01:10 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re:  systemdandtimezone] gene heskett <gheskett@shentel.net> - 2024-01-07 05:30 +0100
                Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy [was: Re:  systemdandtimezone] Nate Bargmann <n0nb@n0nb.us> - 2024-01-07 12:30 +0100
                Re: SOLVED FOR GENE Felix Miata <mrmazda@earthlink.net> - 2024-01-07 12:40 +0100
                Re: SOLVED FOR GENE jeremy ardley <jeremy.ardley@gmail.com> - 2024-01-07 13:10 +0100
                Re: SOLVED FOR GENE john doe <johndoe65534@mail.com> - 2024-01-07 13:40 +0100
                Re: SOLVED FOR GENE Michael Stone <mstone@debian.org> - 2024-01-11 14:30 +0100
                Re: SOLVED FOR GENE Felix Miata <mrmazda@earthlink.net> - 2024-01-11 18:10 +0100
                manpages package [WAS Re: SOLVED FOR GENE:Re: was: Re: tzdata-legacy  [was: Re: systemd and timezone] "Andrew M.A. Cater" <amacater@einval.com> - 2024-01-06 23:50 +0100
                Re: was: Re: tzdata-legacy [was: Re: systemd and timezone] Max Nikulin <manikulin@gmail.com> - 2024-01-06 18:10 +0100
                Re: was: Re: tzdata-legacy [was: Re: systemd and timezone] gene heskett <gheskett@shentel.net> - 2024-01-06 20:40 +0100
                systemd-timesyncd Max Nikulin <manikulin@gmail.com> - 2024-01-07 16:50 +0100
                Re: systemd-timesyncd John Hasler <john@sugarbit.com> - 2024-01-07 17:30 +0100
                Re: systemd-timesyncd gene heskett <gheskett@shentel.net> - 2024-01-07 21:20 +0100
                Re: systemd-timesyncd Charles Kroeger <mbone@gmx.co.uk> - 2024-01-08 06:50 +0100
                Re: systemd-timesyncd gene heskett <gheskett@shentel.net> - 2024-01-07 21:10 +0100
                Re: systemd-timesyncd "Andrew M.A. Cater" <amacater@einval.com> - 2024-01-07 22:00 +0100
                Re: systemd-timesyncd Charles Curley <charlescurley@charlescurley.com> - 2024-01-08 00:00 +0100
                Re: systemd-timesyncd Nicholas Geovanis <nickgeovanis@gmail.com> - 2024-01-08 01:40 +0100
                VAX emulation/simulation (was Re: systemd-timesyncd) The Wanderer <wanderer@fastmail.fm> - 2024-01-08 02:10 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) Bret Busby <bret@busby.net> - 2024-01-08 10:40 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) "Jeremy Nicoll" <jn.ml.dbi.73@letterboxes.org> - 2024-01-08 11:40 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) "Thomas Schmitt" <scdbackup@gmx.net> - 2024-01-08 13:20 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) Nicholas Geovanis <nickgeovanis@gmail.com> - 2024-01-09 01:00 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) "Thomas Schmitt" <scdbackup@gmx.net> - 2024-01-09 09:20 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) Bret Busby <bret@busby.net> - 2024-01-09 10:40 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) "Thomas Schmitt" <scdbackup@gmx.net> - 2024-01-09 11:20 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) Nicolas George <george@nsup.org> - 2024-01-09 11:40 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) gene heskett <gheskett@shentel.net> - 2024-01-09 12:30 +0100
                Re: VAX emulation/simulation (was Re: systemd-timesyncd) "Niall O'Reilly" <niall+lists@no8.be> - 2024-01-08 21:50 +0100
                Re: systemd-timesyncd gene heskett <gheskett@shentel.net> - 2024-01-08 16:00 +0100
                Re: systemd-timesyncd gene heskett <gheskett@shentel.net> - 2024-01-08 16:00 +0100
                Re: systemd-timesyncd Max Nikulin <manikulin@gmail.com> - 2024-01-08 04:40 +0100
                Re: systemd-timesyncd Curt <curty@free.fr> - 2024-01-08 18:00 +0100
                Re: systemd-timesyncd Max Nikulin <manikulin@gmail.com> - 2024-01-08 04:20 +0100
                Re: systemd-timesyncd Charles Curley <charlescurley@charlescurley.com> - 2024-01-08 05:10 +0100
                Re: systemd-timesyncd Mark Fletcher <mark27q1@gmail.com> - 2024-01-08 14:50 +0100
                mktime (was: Re: systemd and timezone) Max Nikulin <manikulin@gmail.com> - 2023-12-23 18:00 +0100
                Re: mktime (was: Re: systemd and timezone) Jeffrey Walton <noloader@gmail.com> - 2023-12-23 19:30 +0100
                Re: mktime Max Nikulin <manikulin@gmail.com> - 2023-12-24 03:40 +0100
                Re: mktime (was: Re: systemd and timezone) <tomas@tuxteam.de> - 2023-12-24 08:40 +0100
                Re: mktime Max Nikulin <manikulin@gmail.com> - 2023-12-28 03:40 +0100
                Re: systemd and timezone Max Nikulin <manikulin@gmail.com> - 2023-12-21 16:30 +0100
                Re: difference in seconds between two formatted dates ... Max Nikulin <manikulin@gmail.com> - 2023-12-22 03:20 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-22 08:00 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-21 05:40 +0100
                Re: difference in seconds between two formatted dates ... Max Nikulin <manikulin@gmail.com> - 2023-12-21 06:50 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-21 07:10 +0100
                Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-21 08:10 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-21 13:40 +0100
                Re: difference in seconds between two formatted dates ... Max Nikulin <manikulin@gmail.com> - 2023-12-21 16:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-21 19:30 +0100
                Re: difference in seconds between two formatted dates ... gene heskett <gheskett@shentel.net> - 2023-12-21 21:00 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-21 21:10 +0100
                Re: difference in seconds between two formatted dates ... gene heskett <gheskett@shentel.net> - 2023-12-21 21:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-21 22:40 +0100
                Re: difference in seconds between two formatted dates ... gene heskett <gheskett@shentel.net> - 2023-12-22 00:40 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-25 16:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-25 18:40 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-26 08:00 +0100
                Re: difference in seconds between two formatted dates ... "Thomas Schmitt" <scdbackup@gmx.net> - 2023-12-26 08:30 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-26 16:00 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-26 16:40 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-26 19:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-26 22:40 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-27 01:40 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-27 01:50 +0100
                When strace breaks process or is blocked (was: Re: difference in  seconds between two formatted dates ...) Max Nikulin <manikulin@gmail.com> - 2023-12-27 17:50 +0100
            Re: difference in seconds between two formatted dates ... Max Nikulin <manikulin@gmail.com> - 2023-12-18 03:30 +0100
              Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-25 00:10 +0100
                Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-25 01:10 +0100
                Re: difference in seconds between two formatted dates ... Albretch Mueller <lbrtchx@gmail.com> - 2023-12-25 01:30 +0100
                Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-25 02:20 +0100
                Re: difference in seconds between two formatted dates ... "Andrew M.A. Cater" <amacater@einval.com> - 2023-12-25 11:40 +0100
                Re: difference in seconds between two formatted dates ... Tixy <tixy@yxit.co.uk> - 2023-12-25 09:10 +0100
                Re: difference in seconds between two formatted dates ... Andy Smith <andy@strugglers.net> - 2023-12-27 00:00 +0100
        Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-17 19:00 +0100
        Re: difference in seconds between two formatted dates ... David Wright <deblis@lionunicorn.co.uk> - 2023-12-17 19:30 +0100
    Re: difference in seconds between two formatted dates ... Teemu Likonen <tlikonen@iki.fi> - 2023-12-17 12:50 +0100
  Re: difference in seconds between two formatted dates ... <tomas@tuxteam.de> - 2023-12-17 12:10 +0100
  Re: difference in seconds between two formatted dates ... Greg Wooledge <greg@wooledge.org> - 2023-12-17 15:10 +0100

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