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Subject: bug#17161: Bug in date arithmetic of date
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Hi,
There seems to be some weirdness in date arithmetic when dates
include a time stamp (and all provided in ISO formatting):
Correct:
mrjb@THE-D-MRJB:~$ date -d "2014-03-11" +"%Y-%m-%d %H:%M:%S"
2014-03-11 00:00:00
mrjb@THE-D-MRJB:~$ date -d "2014-03-11 -1 day" +"%Y-%m-%d %H:%M:%S"
2014-03-10 00:00:00
Incorrect:
mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d
%H:%M:%S"
2014-03-11 15:34:00
mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d
%H:%M:%S"
2014-03-11 11:34:00
mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%S"
2014-03-12 13:34:00
mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%S"
2014-03-12 11:34:00
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.503 (Entity 5.503) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: "Marc R.J. Brevoort" <mrjb@HIDDEN> Subject: bug#17161: Acknowledgement (Bug in date arithmetic of date) Message-ID: <handler.17161.B.13963674413468.ack <at> debbugs.gnu.org> References: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Gnu-PR-Message: ack 17161 X-Gnu-PR-Package: coreutils Reply-To: 17161 <at> debbugs.gnu.org Date: Tue, 01 Apr 2014 15:51:05 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-coreutils@HIDDEN If you wish to submit further information on this problem, please send it to 17161 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 17161: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17161 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#17161: Acknowledgement (Bug in date arithmetic of date)
Resent-From: "Marc R.J. Brevoort" <mrjb@HIDDEN>
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From: "Marc R.J. Brevoort" <mrjb@HIDDEN>
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Additional information -
The behaviour occurs in GNU coreutils 7.4. Version 8.5 appears to work
correctly so this may be a dupe.
Received: (at control) by debbugs.gnu.org; 1 Apr 2014 16:05:36 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Apr 01 12:05:36 2014 Received: from localhost ([127.0.0.1]:59567 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WV1Bv-0001KS-Gk for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 12:05:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:63910) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eblake@HIDDEN>) id 1WV1Bq-0001KA-7Y; Tue, 01 Apr 2014 12:05:32 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s31G5STX016624 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 1 Apr 2014 12:05:28 -0400 Received: from [10.3.113.179] (ovpn-113-179.phx2.redhat.com [10.3.113.179]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id s31G5Sdb019750; Tue, 1 Apr 2014 12:05:28 -0400 Message-ID: <533AE3C7.8080502@HIDDEN> Date: Tue, 01 Apr 2014 10:05:27 -0600 From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: "Marc R.J. Brevoort" <mrjb@HIDDEN>, 17161-done <at> debbugs.gnu.org Subject: Re: bug#17161: Bug in date arithmetic of date References: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> In-Reply-To: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Enigmail-Version: 1.6 OpenPGP: url=http://people.redhat.com/eblake/eblake.gpg Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="KxhlDcLjA11FDMJb87wBrbhia329BTCW8" X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-Spam-Score: -5.6 (-----) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.6 (-----) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable tag 17161 notabug thanks On 04/01/2014 05:30 AM, Marc R.J. Brevoort wrote: > Hi, >=20 > There seems to be some weirdness in date arithmetic when dates > include a time stamp (and all provided in ISO formatting): The weirdness is caused by your choice of locale, coupled with your government's use of daylight savings, and not a bug in 'date'. See also the FAQ: https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-co= mmand-is-not-working-right_002e > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 15:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 11:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 13:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 11:34:00 These examples happen to cross a daylight savings boundary in your current locale. If you would amend your example to include time zone names, you would see the name change, as evidence that the dates listed are really 2 (or 24) hours apart, even though the wall clock time appears to be 1 hour off. You can also force date to operate on --utc, which does not observe daylight savings, and therefore is immune to these oddities. As such, I'm closing this as not a bug. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJTOuPHAAoJEKeha0olJ0Nqw7AIAK5OcxxcEVA5u04FpnvlHhLN cfrI3cpPUCV2LIafrAGh+6Tbu8blEa0YC9NrsfJEOKgLMab1JRimcFKfsLXlIBCJ 4bBd4peiMohVN4teUMW1YgOdoMWLRT4pa7VAHt8BKOG5IIQ5uhqNvThq1N1SvxqW gTHlG++h6W72y+xsIcAosK1B/dh27q8qeuVyvx9l2m8YZ7yY6CV54isWOLog6ChO EQzZcDfEXjDf565snyhtgdVTT2FxppzYUrMv433T3kdrPRziFY6bNeg9DN/c+bfR 630TAHXfZAFdb2Az4kVBeJN74fD6aB85v2gkcWwuMi0aqGir3u6XlV84Bo/bJ2s= =41YW -----END PGP SIGNATURE----- --KxhlDcLjA11FDMJb87wBrbhia329BTCW8--
MIME-Version: 1.0 X-Mailer: MIME-tools 5.503 (Entity 5.503) X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Eric Blake <eblake@HIDDEN> Subject: bug#17161: closed (Bug in date arithmetic of date) CC: tracker <at> debbugs.gnu.org Message-ID: <handler.17161.D17161.13963683355115.ackdone <at> debbugs.gnu.org> References: <533AE3C7.8080502@HIDDEN> <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Gnu-PR-Message: closed 17161 X-Gnu-PR-Package: coreutils X-Gnu-PR-Keywords: notabug Date: Tue, 01 Apr 2014 16:06:03 +0000 Content-Type: multipart/mixed; boundary="----------=_1396368363-5170-0" This is a multi-part message in MIME format... ------------=_1396368363-5170-0 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 Your message dated Tue, 01 Apr 2014 10:05:27 -0600 with message-id <533AE3C7.8080502@HIDDEN> and subject line Re: bug#17161: Bug in date arithmetic of date has caused the debbugs.gnu.org bug report #17161, regarding Bug in date arithmetic of date to be marked as done. (If you believe you have received this mail in error, please contact help-debbugs@HIDDEN) --=20 17161: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17161 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems ------------=_1396368363-5170-0 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 1 Apr 2014 15:50:41 +0000 Received: from localhost ([127.0.0.1]:59538 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WV0xU-0000ts-77 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 11:50:40 -0400 Received: from eggs.gnu.org ([208.118.235.92]:57154) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <mrjb@HIDDEN>) id 1WUwua-0001Hw-P3 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuQ-0007ng-M5 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:24 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:38652) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuQ-0007nc-Ja for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58673) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuJ-0003Np-4L for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:31:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuB-0007gm-Lm for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:31:07 -0400 Received: from mx1.snt.utwente.nl ([130.89.149.33]:38073) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuB-0007SO-Ga for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:30:59 -0400 Received: from ringbreak.dnd.utwente.nl ([130.89.148.32] ident=Debian-exim) by mx1.snt.utwente.nl with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from <mrjb@HIDDEN>) id 1WUwtU-0004hW-Jj for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 13:30:21 +0200 Received: from mrjb (helo=localhost) by ringbreak.dnd.utwente.nl with local-esmtp (Exim 4.72) (envelope-from <mrjb@HIDDEN>) id 1WUwtU-0007ml-3W for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 13:30:16 +0200 Date: Tue, 1 Apr 2014 13:30:16 +0200 (CEST) From: "Marc R.J. Brevoort" <mrjb@HIDDEN> To: bug-coreutils@HIDDEN Subject: Bug in date arithmetic of date Message-ID: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII X-SNT-Signature: f6dda9c21ec6c20fb742f2ad25af7f8a099a7ad2 X-SNT-Spam-Score: -1.6 X-SNT-Spam-Score-Bar: - X-SNT-Spam-Report: Content analysis details: (-1.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Tue, 01 Apr 2014 11:50:38 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) Hi, There seems to be some weirdness in date arithmetic when dates include a time stamp (and all provided in ISO formatting): Correct: mrjb@THE-D-MRJB:~$ date -d "2014-03-11" +"%Y-%m-%d %H:%M:%S" 2014-03-11 00:00:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 -1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-10 00:00:00 Incorrect: mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d %H:%M:%S" 2014-03-11 15:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d %H:%M:%S" 2014-03-11 11:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-12 13:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-12 11:34:00 ------------=_1396368363-5170-0 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 17161-done) by debbugs.gnu.org; 1 Apr 2014 16:05:35 +0000 Received: from localhost ([127.0.0.1]:59565 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WV1Bu-0001KO-AO for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 12:05:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:63910) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eblake@HIDDEN>) id 1WV1Bq-0001KA-7Y; Tue, 01 Apr 2014 12:05:32 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s31G5STX016624 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 1 Apr 2014 12:05:28 -0400 Received: from [10.3.113.179] (ovpn-113-179.phx2.redhat.com [10.3.113.179]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id s31G5Sdb019750; Tue, 1 Apr 2014 12:05:28 -0400 Message-ID: <533AE3C7.8080502@HIDDEN> Date: Tue, 01 Apr 2014 10:05:27 -0600 From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: "Marc R.J. Brevoort" <mrjb@HIDDEN>, 17161-done <at> debbugs.gnu.org Subject: Re: bug#17161: Bug in date arithmetic of date References: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> In-Reply-To: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Enigmail-Version: 1.6 OpenPGP: url=http://people.redhat.com/eblake/eblake.gpg Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="KxhlDcLjA11FDMJb87wBrbhia329BTCW8" X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-Spam-Score: -5.6 (-----) X-Debbugs-Envelope-To: 17161-done X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.6 (-----) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable tag 17161 notabug thanks On 04/01/2014 05:30 AM, Marc R.J. Brevoort wrote: > Hi, >=20 > There seems to be some weirdness in date arithmetic when dates > include a time stamp (and all provided in ISO formatting): The weirdness is caused by your choice of locale, coupled with your government's use of daylight savings, and not a bug in 'date'. See also the FAQ: https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-co= mmand-is-not-working-right_002e > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 15:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 11:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 13:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 11:34:00 These examples happen to cross a daylight savings boundary in your current locale. If you would amend your example to include time zone names, you would see the name change, as evidence that the dates listed are really 2 (or 24) hours apart, even though the wall clock time appears to be 1 hour off. You can also force date to operate on --utc, which does not observe daylight savings, and therefore is immune to these oddities. As such, I'm closing this as not a bug. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJTOuPHAAoJEKeha0olJ0Nqw7AIAK5OcxxcEVA5u04FpnvlHhLN cfrI3cpPUCV2LIafrAGh+6Tbu8blEa0YC9NrsfJEOKgLMab1JRimcFKfsLXlIBCJ 4bBd4peiMohVN4teUMW1YgOdoMWLRT4pa7VAHt8BKOG5IIQ5uhqNvThq1N1SvxqW gTHlG++h6W72y+xsIcAosK1B/dh27q8qeuVyvx9l2m8YZ7yY6CV54isWOLog6ChO EQzZcDfEXjDf565snyhtgdVTT2FxppzYUrMv433T3kdrPRziFY6bNeg9DN/c+bfR 630TAHXfZAFdb2Az4kVBeJN74fD6aB85v2gkcWwuMi0aqGir3u6XlV84Bo/bJ2s= =41YW -----END PGP SIGNATURE----- --KxhlDcLjA11FDMJb87wBrbhia329BTCW8-- ------------=_1396368363-5170-0--
MIME-Version: 1.0 X-Mailer: MIME-tools 5.503 (Entity 5.503) X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: "Marc R.J. Brevoort" <mrjb@HIDDEN> Subject: bug#17161: closed (Re: bug#17161: Bug in date arithmetic of date) Message-ID: <handler.17161.D17161.13963683355115.notifdone <at> debbugs.gnu.org> References: <533AE3C7.8080502@HIDDEN> <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Gnu-PR-Message: they-closed 17161 X-Gnu-PR-Package: coreutils X-Gnu-PR-Keywords: notabug Reply-To: 17161 <at> debbugs.gnu.org Date: Tue, 01 Apr 2014 16:06:04 +0000 Content-Type: multipart/mixed; boundary="----------=_1396368364-5170-1" This is a multi-part message in MIME format... ------------=_1396368364-5170-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Your bug report #17161: Bug in date arithmetic of date which was filed against the coreutils package, has been closed. The explanation is attached below, along with your original report. If you require more details, please reply to 17161 <at> debbugs.gnu.org. --=20 17161: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D17161 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems ------------=_1396368364-5170-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at 17161-done) by debbugs.gnu.org; 1 Apr 2014 16:05:35 +0000 Received: from localhost ([127.0.0.1]:59565 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WV1Bu-0001KO-AO for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 12:05:35 -0400 Received: from mx1.redhat.com ([209.132.183.28]:63910) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <eblake@HIDDEN>) id 1WV1Bq-0001KA-7Y; Tue, 01 Apr 2014 12:05:32 -0400 Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s31G5STX016624 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Tue, 1 Apr 2014 12:05:28 -0400 Received: from [10.3.113.179] (ovpn-113-179.phx2.redhat.com [10.3.113.179]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id s31G5Sdb019750; Tue, 1 Apr 2014 12:05:28 -0400 Message-ID: <533AE3C7.8080502@HIDDEN> Date: Tue, 01 Apr 2014 10:05:27 -0600 From: Eric Blake <eblake@HIDDEN> Organization: Red Hat, Inc. User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: "Marc R.J. Brevoort" <mrjb@HIDDEN>, 17161-done <at> debbugs.gnu.org Subject: Re: bug#17161: Bug in date arithmetic of date References: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> In-Reply-To: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> X-Enigmail-Version: 1.6 OpenPGP: url=http://people.redhat.com/eblake/eblake.gpg Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="KxhlDcLjA11FDMJb87wBrbhia329BTCW8" X-Scanned-By: MIMEDefang 2.67 on 10.5.11.12 X-Spam-Score: -5.6 (-----) X-Debbugs-Envelope-To: 17161-done X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.6 (-----) This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable tag 17161 notabug thanks On 04/01/2014 05:30 AM, Marc R.J. Brevoort wrote: > Hi, >=20 > There seems to be some weirdness in date arithmetic when dates > include a time stamp (and all provided in ISO formatting): The weirdness is caused by your choice of locale, coupled with your government's use of daylight savings, and not a bug in 'date'. See also the FAQ: https://www.gnu.org/software/coreutils/faq/coreutils-faq.html#The-date-co= mmand-is-not-working-right_002e > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 15:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d %H:%M= :%S" > 2014-03-11 11:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 13:34:00 > mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%= S" > 2014-03-12 11:34:00 These examples happen to cross a daylight savings boundary in your current locale. If you would amend your example to include time zone names, you would see the name change, as evidence that the dates listed are really 2 (or 24) hours apart, even though the wall clock time appears to be 1 hour off. You can also force date to operate on --utc, which does not observe daylight savings, and therefore is immune to these oddities. As such, I'm closing this as not a bug. --=20 Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org --KxhlDcLjA11FDMJb87wBrbhia329BTCW8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: Public key at http://people.redhat.com/eblake/eblake.gpg Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBCAAGBQJTOuPHAAoJEKeha0olJ0Nqw7AIAK5OcxxcEVA5u04FpnvlHhLN cfrI3cpPUCV2LIafrAGh+6Tbu8blEa0YC9NrsfJEOKgLMab1JRimcFKfsLXlIBCJ 4bBd4peiMohVN4teUMW1YgOdoMWLRT4pa7VAHt8BKOG5IIQ5uhqNvThq1N1SvxqW gTHlG++h6W72y+xsIcAosK1B/dh27q8qeuVyvx9l2m8YZ7yY6CV54isWOLog6ChO EQzZcDfEXjDf565snyhtgdVTT2FxppzYUrMv433T3kdrPRziFY6bNeg9DN/c+bfR 630TAHXfZAFdb2Az4kVBeJN74fD6aB85v2gkcWwuMi0aqGir3u6XlV84Bo/bJ2s= =41YW -----END PGP SIGNATURE----- --KxhlDcLjA11FDMJb87wBrbhia329BTCW8-- ------------=_1396368364-5170-1 Content-Type: message/rfc822 Content-Disposition: inline Content-Transfer-Encoding: 7bit Received: (at submit) by debbugs.gnu.org; 1 Apr 2014 15:50:41 +0000 Received: from localhost ([127.0.0.1]:59538 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1WV0xU-0000ts-77 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 11:50:40 -0400 Received: from eggs.gnu.org ([208.118.235.92]:57154) by debbugs.gnu.org with esmtp (Exim 4.80) (envelope-from <mrjb@HIDDEN>) id 1WUwua-0001Hw-P3 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuQ-0007ng-M5 for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:24 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:38652) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuQ-0007nc-Ja for submit <at> debbugs.gnu.org; Tue, 01 Apr 2014 07:31:14 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58673) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuJ-0003Np-4L for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:31:14 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuB-0007gm-Lm for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:31:07 -0400 Received: from mx1.snt.utwente.nl ([130.89.149.33]:38073) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from <mrjb@HIDDEN>) id 1WUwuB-0007SO-Ga for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 07:30:59 -0400 Received: from ringbreak.dnd.utwente.nl ([130.89.148.32] ident=Debian-exim) by mx1.snt.utwente.nl with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.72) (envelope-from <mrjb@HIDDEN>) id 1WUwtU-0004hW-Jj for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 13:30:21 +0200 Received: from mrjb (helo=localhost) by ringbreak.dnd.utwente.nl with local-esmtp (Exim 4.72) (envelope-from <mrjb@HIDDEN>) id 1WUwtU-0007ml-3W for bug-coreutils@HIDDEN; Tue, 01 Apr 2014 13:30:16 +0200 Date: Tue, 1 Apr 2014 13:30:16 +0200 (CEST) From: "Marc R.J. Brevoort" <mrjb@HIDDEN> To: bug-coreutils@HIDDEN Subject: Bug in date arithmetic of date Message-ID: <alpine.DEB.2.00.1404011325170.29333@HIDDEN> User-Agent: Alpine 2.00 (DEB 1167 2008-08-23) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; format=flowed; charset=US-ASCII X-SNT-Signature: f6dda9c21ec6c20fb742f2ad25af7f8a099a7ad2 X-SNT-Spam-Score: -1.6 X-SNT-Spam-Score-Bar: - X-SNT-Spam-Report: Content analysis details: (-1.6 points, 5.0 required) pts rule name description ---- ---------------------- -------------------------------------------------- -1.0 ALL_TRUSTED Passed through trusted hosts only via SMTP -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -0.6 RP_MATCHES_RCVD Envelope sender domain matches handover relay domain X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -5.0 (-----) X-Debbugs-Envelope-To: submit X-Mailman-Approved-At: Tue, 01 Apr 2014 11:50:38 -0400 X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <http://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <http://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <http://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -5.0 (-----) Hi, There seems to be some weirdness in date arithmetic when dates include a time stamp (and all provided in ISO formatting): Correct: mrjb@THE-D-MRJB:~$ date -d "2014-03-11" +"%Y-%m-%d %H:%M:%S" 2014-03-11 00:00:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 -1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-10 00:00:00 Incorrect: mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -2 hours" +"%Y-%m-%d %H:%M:%S" 2014-03-11 15:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +2 hours" +"%Y-%m-%d %H:%M:%S" 2014-03-11 11:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 -1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-12 13:34:00 mrjb@THE-D-MRJB:~$ date -d "2014-03-11 12:34 +1 day" +"%Y-%m-%d %H:%M:%S" 2014-03-12 11:34:00 ------------=_1396368364-5170-1--
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Subject: bug#17161: closed (Re: bug#17161: Bug in date arithmetic of date)
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Hello,
As a heads-up, the explanation that this is due to time zone+locale doesn't make sense:
mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -1 day" +"%Y-%m-%d
%H:%M:%S"
2014-03-12 13:34:56
mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -2 days" +"%Y-%m-%d
%H:%M:%S"
2014-03-12 14:34:56
mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -3 days" +"%Y-%m-%d
%H:%M:%S"
2014-03-12 15:34:56
The more days I subtract, the more hours are added. If this were a time
zone issue, the amount of hours added would be constant but the
resulting date would not.
Best,
Marc
On Tue, 1 Apr 2014, GNU bug Tracking System wrote:
> Your bug report
>
> #17161: Bug in date arithmetic of date
>
> which was filed against the coreutils package, has been closed.
>
> The explanation is attached below, along with your original report.
> If you require more details, please reply to 17161 <at> debbugs.gnu.org.
>
> --
> 17161: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17161
> GNU Bug Tracking System
> Contact help-debbugs@HIDDEN with problems
>
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Subject: bug#17161: closed (Re: bug#17161: Bug in date arithmetic of date)
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reopen 17161
thanks
On 04/02/2014 02:17 AM, Marc R.J. Brevoort wrote:
> Hello,
>=20
> As a heads-up, the explanation that this is due to time zone+locale
> doesn't make sense:
>=20
> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -1 day" +"%Y-%m-%=
d
> %H:%M:%S"
> 2014-03-12 13:34:56
> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -2 days"
> +"%Y-%m-%d %H:%M:%S"
> 2014-03-12 14:34:56
> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -3 days"
> +"%Y-%m-%d %H:%M:%S"
> 2014-03-12 15:34:56
>=20
> The more days I subtract, the more hours are added. If this were a time=
> zone issue, the amount of hours added would be constant but the
> resulting date would not.
Thanks for persisting. I was able to reproduce using coreutils.git, and
I can explain what's happening. Date is parsing this as:
"(2014-03-11 12:34:56 -3) (days)"
that is, -3 is being treated as the timezone, since it occurs next to
the hour specification; then treating "days" as "+1 day" or "+24 hours".
Watch what happens when you reorder the line to force a different parse:
$ src/date --utc -d "-3 days 2014-03-11 12:34:56" +"%Y-%m-%d %H:%M:%S"
2014-03-08 12:34:56
It does indeed seem awkward that date is not parsing this as:
"(2014-03-11 12:34:56) (-3 days)"
but fixing that will require tweaks to the getdate.y parser in gnulib.
I've reopened the bug to track the issue with awkward precedence in the
parser.
--=20
Eric Blake eblake redhat com +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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Date: Wed, 2 Apr 2014 16:48:40 +0200 (CEST)
From: "Marc R.J. Brevoort" <mrjb@HIDDEN>
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Hi,
Yes, I've come to the same conclusion (i.e. the numeric value in "+3 days"
or "-2 days" being treated as time zone). The 8.5 coreutils I tested on
is in a different time zone so it is possible it doesn't exhibit the same
behavior because of that, and as such I can't actually tell whether the
behavior is actually resolved in coreutils 8.5.
I confirm that if I type,
mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 0 -1 day" +"%Y-%m-%d
%H:%M:%S"
(i.e. using "0" as time zone), this gives the expected output,
2014-03-10 12:34:56
Best,
Marc
On Wed, 2 Apr 2014, Eric Blake wrote:
> reopen 17161
> thanks
>
> On 04/02/2014 02:17 AM, Marc R.J. Brevoort wrote:
>> Hello,
>>
>> As a heads-up, the explanation that this is due to time zone+locale
>> doesn't make sense:
>>
>> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -1 day" +"%Y-%m-%d
>> %H:%M:%S"
>> 2014-03-12 13:34:56
>> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -2 days"
>> +"%Y-%m-%d %H:%M:%S"
>> 2014-03-12 14:34:56
>> mrjb@THE-D-MRJB:~$ date --utc -d "2014-03-11 12:34:56 -3 days"
>> +"%Y-%m-%d %H:%M:%S"
>> 2014-03-12 15:34:56
>>
>> The more days I subtract, the more hours are added. If this were a time
>> zone issue, the amount of hours added would be constant but the
>> resulting date would not.
>
> Thanks for persisting. I was able to reproduce using coreutils.git, and
> I can explain what's happening. Date is parsing this as:
>
> "(2014-03-11 12:34:56 -3) (days)"
>
> that is, -3 is being treated as the timezone, since it occurs next to
> the hour specification; then treating "days" as "+1 day" or "+24 hours".
>
> Watch what happens when you reorder the line to force a different parse:
>
> $ src/date --utc -d "-3 days 2014-03-11 12:34:56" +"%Y-%m-%d %H:%M:%S"
> 2014-03-08 12:34:56
>
> It does indeed seem awkward that date is not parsing this as:
>
> "(2014-03-11 12:34:56) (-3 days)"
>
> but fixing that will require tweaks to the getdate.y parser in gnulib.
> I've reopened the bug to track the issue with awkward precedence in the
> parser.
>
> --
> Eric Blake eblake redhat com +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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Subject: bug#17161: date: confusing: "TIME -/+NUM" treated as time zone
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From: Assaf Gordon <assafgordon@HIDDEN>
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severity 17161 wishlist
retitle 17161 date: confusing: "TIME -/+NUM" treated as time zone
stop
(triaging old bugs)
Hello,
On 02/04/14 05:27 AM, Eric Blake wrote:
> On 04/02/2014 02:17 AM, Marc R.J. Brevoort wrote:
>>
>> The more days I subtract, the more hours are added. If this were a time
>> zone issue, the amount of hours added would be constant but the
>> resulting date would not.
>
> Thanks for persisting. I was able to reproduce using coreutils.git, and
> I can explain what's happening. Date is parsing this as:
>
> "(2014-03-11 12:34:56 -3) (days)"
[...]
> It does indeed seem awkward that date is not parsing this as:
>
> "(2014-03-11 12:34:56) (-3 days)"
>
> but fixing that will require tweaks to the getdate.y parser in gnulib.
> I've reopened the bug to track the issue with awkward precedence in the
> parser.
In the mean time, date gained the "--debug" option that makes
diagnosing these issues somewhat easier.
Due to the way the date parser works, the following
rules apply:
1.
Time (HH:MM:SS) followed by a plus/minus character
and a number - ALWAYS parsed as time zone.
The unit that followed (e.g. "days" / "minutes")
are then taken to be of value 1 (e.g. 1 day, 1 minute).
Examples:
## This is "Timezone=3, plus one day"
$ date --debug -d "2014-03-11 12:34:56 +3 days"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56 UTC+03
date: parsed relative part: +1 day(s)
date: input timezone: parsed date/time string (+03)
[...]
Wed Mar 12 03:34:56 MDT 2014
## This is "Timezone=-10, plus one month"
$ date --debug -d "2014-03-11 12:34:56 -10 months"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56 UTC-10
date: parsed relative part: +1 month(s)
date: input timezone: parsed date/time string (-10)
[...]
Fri Apr 11 16:34:56 MDT 2014
2.
Time (HH:MM:SS) followed by a number without plus/minus sign,
The number applies to the units.
## This is "time, plus 7 seconds"
$ date --debug -d "2014-03-11 12:34:56 7 seconds"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56
date: parsed relative part: +7 seconds
[...]
Tue Mar 11 12:35:03 MDT 2014
3.
To subtract units (e.g. three days) without using a minus character
(i.e. forcing rule #2 instead of triggering rule #1), use the word "ago":
## This is "time - 7 seconds"
$ date --debug -d "2014-03-11 12:34:56 7 seconds ago"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56
date: parsed relative part: -7 seconds
[...]
Tue Mar 11 12:34:49 MDT 2014
## This is 3 days subtraction
$ date --debug -d "2014-03-11 12:34:56 3 days ago"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56
date: parsed relative part: -3 day(s)
[...]
Sat Mar 8 12:34:56 MST 2014
Or use Eric's suggestion of putting the "-3 days"
before the date.
4.
Combining a time zone and a unit value is valid,
e.g.
## Timezone = -10, 9 days subtraction
$ date --debug -d "2014-03-11 12:34:56 -10 -9 days"
date: parsed date part: (Y-M-D) 2014-03-11
date: parsed time part: 12:34:56 UTC-10
date: parsed relative part: -9 day(s)
date: input timezone: parsed date/time string (-10)
[...]
Sun Mar 2 15:34:56 MST 2014
----
As Eric wrote above, modifying the parser could be done in gnulib.
Not so much a technical problem, but very likely to be backward-
incompatible in a way that will break many many existing scripts.
As such, I'm marking this as "wishlist", but keeping it open -
discussion is welcomed to continue by replying to this thread.
regards,
- assaf
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[184.68.105.38]) by smtp.googlemail.com with ESMTPSA id 82-v6sm1937446ita.17.2018.10.19.20.13.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Oct 2018 20:13:56 -0700 (PDT) Subject: Re: bug#17161: date: confusing: "TIME -/+NUM" treated as time zone To: Eric Blake <eblake@HIDDEN>, "Marc R.J. Brevoort" <mrjb@HIDDEN>, 17161 <at> debbugs.gnu.org References: <533AE3C7.8080502@HIDDEN> <alpine.DEB.2.00.1404011325170.29333@HIDDEN> <handler.17161.D17161.13963683355115.notifdone <at> debbugs.gnu.org> <alpine.DEB.2.00.1404021014300.14439@HIDDEN> <533BF42F.30600@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <de234f7a-ec3e-13c4-af7d-ca28696dee4d@HIDDEN> Date: Fri, 19 Oct 2018 21:13:55 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <533BF42F.30600@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) severity 17161 wishlist retitle 17161 date: confusing: "TIME -/+NUM" treated as time zone stop (triaging old bugs) Hello, On 02/04/14 05:27 AM, Eric Blake wrote: > On 04/02/2014 02:17 AM, Marc R.J. Brevoort wrote: >> >> The more days I subtract, the more hours are added. If this were a time >> zone issue, the amount of hours added would be constant but the >> resulting date would not. > > Thanks for persisting. I was able to reproduce using coreutils.git, and > I can explain what's happening. Date is parsing this as: > > "(2014-03-11 12:34:56 -3) (days)" [...] > It does indeed seem awkward that date is not parsing this as: > > "(2014-03-11 12:34:56) (-3 days)" > > but fixing that will require tweaks to the getdate.y parser in gnulib. > I've reopened the bug to track the issue with awkward precedence in the > parser. In the mean time, date gained the "--debug" option that makes diagnosing these issues somewhat easier. Due to the way the date parser works, the following rules apply: 1. Time (HH:MM:SS) followed by a plus/minus character and a number - ALWAYS parsed as time zone. The unit that followed (e.g. "days" / "minutes") are then taken to be of value 1 (e.g. 1 day, 1 minute). Examples: ## This is "Timezone=3, plus one day" $ date --debug -d "2014-03-11 12:34:56 +3 days" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC+03 date: parsed relative part: +1 day(s) date: input timezone: parsed date/time string (+03) [...] Wed Mar 12 03:34:56 MDT 2014 ## This is "Timezone=-10, plus one month" $ date --debug -d "2014-03-11 12:34:56 -10 months" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC-10 date: parsed relative part: +1 month(s) date: input timezone: parsed date/time string (-10) [...] Fri Apr 11 16:34:56 MDT 2014 2. Time (HH:MM:SS) followed by a number without plus/minus sign, The number applies to the units. ## This is "time, plus 7 seconds" $ date --debug -d "2014-03-11 12:34:56 7 seconds" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: +7 seconds [...] Tue Mar 11 12:35:03 MDT 2014 3. To subtract units (e.g. three days) without using a minus character (i.e. forcing rule #2 instead of triggering rule #1), use the word "ago": ## This is "time - 7 seconds" $ date --debug -d "2014-03-11 12:34:56 7 seconds ago" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: -7 seconds [...] Tue Mar 11 12:34:49 MDT 2014 ## This is 3 days subtraction $ date --debug -d "2014-03-11 12:34:56 3 days ago" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: -3 day(s) [...] Sat Mar 8 12:34:56 MST 2014 Or use Eric's suggestion of putting the "-3 days" before the date. 4. Combining a time zone and a unit value is valid, e.g. ## Timezone = -10, 9 days subtraction $ date --debug -d "2014-03-11 12:34:56 -10 -9 days" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC-10 date: parsed relative part: -9 day(s) date: input timezone: parsed date/time string (-10) [...] Sun Mar 2 15:34:56 MST 2014 ---- As Eric wrote above, modifying the parser could be done in gnulib. Not so much a technical problem, but very likely to be backward- incompatible in a way that will break many many existing scripts. As such, I'm marking this as "wishlist", but keeping it open - discussion is welcomed to continue by replying to this thread. regards, - assaf
Received: (at control) by debbugs.gnu.org; 20 Oct 2018 03:14:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Oct 19 23:14:06 2018 Received: from localhost ([127.0.0.1]:60097 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1gDhiH-0003gh-To for submit <at> debbugs.gnu.org; Fri, 19 Oct 2018 23:14:06 -0400 Received: from mail-it1-f178.google.com ([209.85.166.178]:39976) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <assafgordon@HIDDEN>) id 1gDhiG-0003g3-Ar; Fri, 19 Oct 2018 23:14:04 -0400 Received: by mail-it1-f178.google.com with SMTP id i191-v6so6719355iti.5; Fri, 19 Oct 2018 20:14:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:references:from:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=h67qU0BjWMK4lXm7tyGtsjzn92+T2Y8AfMwG28jiVjU=; b=EbkDK2WIqmiMLVXi8hmFgnQq0bFb+U89WQP7elOlxPwIMgVA2bN9W47p3bZpanBIhF q3/HTyMh23ibZj6LyQ9+zMFpz5GeqUIr11CpQwoKwt2K//3hzXb0XYwaBbmOCCKbCaJ2 5H9Papeubja2GBB65PtBhuVCC9gyGzaXxNLa9aVCOuVBrruIQV+wG0DRh+2JnSxr6r63 pnBTOnPlXZNP27pGVWpQ6JPt/GtpHlcS3hIXnIoFLHgc6jN/xs8cYb/OdsRJV9YHHBkd mb8PCCUkGYkutSy2rLMjtq9Qe7e7yUxNuI5ZK23VOpLpIVNYFF8TjG/KKoBn2dXQw7ZG VqvQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=h67qU0BjWMK4lXm7tyGtsjzn92+T2Y8AfMwG28jiVjU=; b=unNLEsZIwU5t8OUf/OGk6Fg9wHTIBwLHgFWXWxJNiQZdXW0asg71nlnSdBYx9lKg7e L89PdreYIOvl6QKs94ExtD3uYJJ3W4hsTBc0Gs5gnX/cXiNdwucb7fnHpoqM5F9QnGPc /fV1Tjtxvn06uVmqjRBQ7S+UZk2dbCoz4cwJPkPLRcr4WAFW4eMKIo0pG/dMCPvheYdQ 3zYQRnSzV3j42ujH7h/n6j9kyehDhiMmHFVCm9L1KT/MVkJcaCbW/z+zB9qFie6RF2mh jjAguVvDl+KZ/bnpkcctEYjXLI8dKb3w+eeBqwk8IQueAMLb4ihcZmQRllb9KAsNBZOs qeAw== X-Gm-Message-State: ABuFfojkv8sqOYh+m8ejCCnBPmP/4LBlISajitrcqIQA2Pgx7gh+kgKr CxVI4d91z1bJetiIp1lb3qaO2RNn+fY= X-Google-Smtp-Source: ACcGV63ghPFegpHnL32Yz+PyjuEF0pqMk7O6SFO5o26sLWMczKpfCxat4T+XfgoT6SDmDrt016L0Rg== X-Received: by 2002:a02:7f0e:: with SMTP id r14-v6mr26158809jac.124.1540005237833; Fri, 19 Oct 2018 20:13:57 -0700 (PDT) Received: from tomato.housegordon.com (moose.housegordon.com. [184.68.105.38]) by smtp.googlemail.com with ESMTPSA id 82-v6sm1937446ita.17.2018.10.19.20.13.56 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Oct 2018 20:13:56 -0700 (PDT) Subject: Re: bug#17161: date: confusing: "TIME -/+NUM" treated as time zone To: Eric Blake <eblake@HIDDEN>, "Marc R.J. Brevoort" <mrjb@HIDDEN>, 17161 <at> debbugs.gnu.org References: <533AE3C7.8080502@HIDDEN> <alpine.DEB.2.00.1404011325170.29333@HIDDEN> <handler.17161.D17161.13963683355115.notifdone <at> debbugs.gnu.org> <alpine.DEB.2.00.1404021014300.14439@HIDDEN> <533BF42F.30600@HIDDEN> From: Assaf Gordon <assafgordon@HIDDEN> Message-ID: <de234f7a-ec3e-13c4-af7d-ca28696dee4d@HIDDEN> Date: Fri, 19 Oct 2018 21:13:55 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <533BF42F.30600@HIDDEN> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Score: -0.0 (/) X-Debbugs-Envelope-To: control X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) severity 17161 wishlist retitle 17161 date: confusing: "TIME -/+NUM" treated as time zone stop (triaging old bugs) Hello, On 02/04/14 05:27 AM, Eric Blake wrote: > On 04/02/2014 02:17 AM, Marc R.J. Brevoort wrote: >> >> The more days I subtract, the more hours are added. If this were a time >> zone issue, the amount of hours added would be constant but the >> resulting date would not. > > Thanks for persisting. I was able to reproduce using coreutils.git, and > I can explain what's happening. Date is parsing this as: > > "(2014-03-11 12:34:56 -3) (days)" [...] > It does indeed seem awkward that date is not parsing this as: > > "(2014-03-11 12:34:56) (-3 days)" > > but fixing that will require tweaks to the getdate.y parser in gnulib. > I've reopened the bug to track the issue with awkward precedence in the > parser. In the mean time, date gained the "--debug" option that makes diagnosing these issues somewhat easier. Due to the way the date parser works, the following rules apply: 1. Time (HH:MM:SS) followed by a plus/minus character and a number - ALWAYS parsed as time zone. The unit that followed (e.g. "days" / "minutes") are then taken to be of value 1 (e.g. 1 day, 1 minute). Examples: ## This is "Timezone=3, plus one day" $ date --debug -d "2014-03-11 12:34:56 +3 days" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC+03 date: parsed relative part: +1 day(s) date: input timezone: parsed date/time string (+03) [...] Wed Mar 12 03:34:56 MDT 2014 ## This is "Timezone=-10, plus one month" $ date --debug -d "2014-03-11 12:34:56 -10 months" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC-10 date: parsed relative part: +1 month(s) date: input timezone: parsed date/time string (-10) [...] Fri Apr 11 16:34:56 MDT 2014 2. Time (HH:MM:SS) followed by a number without plus/minus sign, The number applies to the units. ## This is "time, plus 7 seconds" $ date --debug -d "2014-03-11 12:34:56 7 seconds" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: +7 seconds [...] Tue Mar 11 12:35:03 MDT 2014 3. To subtract units (e.g. three days) without using a minus character (i.e. forcing rule #2 instead of triggering rule #1), use the word "ago": ## This is "time - 7 seconds" $ date --debug -d "2014-03-11 12:34:56 7 seconds ago" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: -7 seconds [...] Tue Mar 11 12:34:49 MDT 2014 ## This is 3 days subtraction $ date --debug -d "2014-03-11 12:34:56 3 days ago" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 date: parsed relative part: -3 day(s) [...] Sat Mar 8 12:34:56 MST 2014 Or use Eric's suggestion of putting the "-3 days" before the date. 4. Combining a time zone and a unit value is valid, e.g. ## Timezone = -10, 9 days subtraction $ date --debug -d "2014-03-11 12:34:56 -10 -9 days" date: parsed date part: (Y-M-D) 2014-03-11 date: parsed time part: 12:34:56 UTC-10 date: parsed relative part: -9 day(s) date: input timezone: parsed date/time string (-10) [...] Sun Mar 2 15:34:56 MST 2014 ---- As Eric wrote above, modifying the parser could be done in gnulib. Not so much a technical problem, but very likely to be backward- incompatible in a way that will break many many existing scripts. As such, I'm marking this as "wishlist", but keeping it open - discussion is welcomed to continue by replying to this thread. regards, - assaf
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