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Subject: bug#44240: coreutils 8.30-3ubuntu2 "date" command doesn't like one specific date: 2020-09-06
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Hi,

for some reason I get an error with one specific date but not with others:

$ for i in 08 09 10; do for j in 5 6 7; do d=3D"2020-$i-0$j"; echo $d $( d=
ate
-d"$d" ); done; done
2020-08-05 Wed 05 Aug 2020 12:00:00 AM -04
2020-08-06 Thu 06 Aug 2020 12:00:00 AM -04
2020-08-07 Fri 07 Aug 2020 12:00:00 AM -04
2020-09-05 Sat 05 Sep 2020 12:00:00 AM -04
date: invalid date =E2=80=982020-09-06=E2=80=99
2020-09-06
2020-09-07 Mon 07 Sep 2020 12:00:00 AM -03
2020-10-05 Mon 05 Oct 2020 12:00:00 AM -03
2020-10-06 Tue 06 Oct 2020 12:00:00 AM -03
2020-10-07 Wed 07 Oct 2020 12:00:00 AM -03

Regards,

Leo Wandersleb

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X-Loop: help-debbugs@HIDDEN
From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Leo Wandersleb <leo.wandersleb@HIDDEN>
Subject: bug#44240: Acknowledgement (coreutils 8.30-3ubuntu2 "date"
 command doesn't like one specific date: 2020-09-06)
Message-ID: <handler.44240.B.160372612830034.ack <at> debbugs.gnu.org>
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X-Gnu-PR-Message: ack 44240
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Reply-To: 44240 <at> debbugs.gnu.org
Date: Mon, 26 Oct 2020 15:29:03 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

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44240: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D44240
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Subject: bug#44240: coreutils 8.30-3ubuntu2 "date" command doesn't like one specific date: 2020-09-06
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On Mon, 26 Oct 2020, at 15:14, Leo Wandersleb wrote:
> for some reason I get an error with one specific date but not with oth=
ers:
>=20
> $ for i in 08 09 10; do for j in 5 6 7; do d=3D"2020-$i-0$j"; echo $d =
$( date
> -d"$d" ); done; done
> 2020-08-05 Wed 05 Aug 2020 12:00:00 AM -04
> 2020-08-06 Thu 06 Aug 2020 12:00:00 AM -04
> 2020-08-07 Fri 07 Aug 2020 12:00:00 AM -04
> 2020-09-05 Sat 05 Sep 2020 12:00:00 AM -04
> date: invalid date =E2=80=982020-09-06=E2=80=99
> 2020-09-06
> 2020-09-07 Mon 07 Sep 2020 12:00:00 AM -03

The clue is the change in timezone offset from -04 to -03. The only loca=
tion I could find which switched on 2020-09-06 was Chile, so we can repr=
oduce the problem with:

$ TZ=3DChile/Continental date --debug -d 2020-09-06
date: parsed date part: (Y-M-D) 2020-09-06
date: input timezone: TZ=3D"Chile/Continental" environment value
date: warning: using midnight as starting time: 00:00:00
date: error: invalid date/time value:
date:     user provided time: '(Y-M-D) 2020-09-06 00:00:00'
date:        normalized time: '(Y-M-D) 2020-09-06 01:00:00'
date:                                             --
date:      possible reasons:
date:        non-existing due to daylight-saving time;
date:        numeric values overflow;
date:        missing timezone
date: invalid date =E2=80=982020-09-06=E2=80=99

Notice that, in Chile's DST rules, the time jumps from 23:59:59 to 01:00=
:00:
$ zdump -v Chile/Continental | grep 2020
Chile/Continental  Sun Apr  5 02:59:59 2020 UT =3D Sat Apr  4 23:59:59 2=
020 -03 isdst=3D1 gmtoff=3D-10800
Chile/Continental  Sun Apr  5 03:00:00 2020 UT =3D Sat Apr  4 23:00:00 2=
020 -04 isdst=3D0 gmtoff=3D-14400
Chile/Continental  Sun Sep  6 03:59:59 2020 UT =3D Sat Sep  5 23:59:59 2=
020 -04 isdst=3D0 gmtoff=3D-14400
Chile/Continental  Sun Sep  6 04:00:00 2020 UT =3D Sun Sep  6 01:00:00 2=
020 -03 isdst=3D1 gmtoff=3D-10800

Therefore there is no valid time "00:00:00", and this is the "non-existi=
ng due to daylight-saving time" case which date --debug reports.

This is an FAQ, which often crops up twice per year:
https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-c=
ommand-is-not-working-right_002e


Cheers,
Phil
Last modified: Mon, 26 Oct 2020 16:30:02 UTC

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