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Date: | Thu, 8 Jan 2015 16:26:38 +0100 |
From: | Corinna Vinschen <corinna-cygwin AT cygwin DOT com> |
To: | cygwin AT cygwin DOT com |
Subject: | Re: Bug in strftime %z (was: Possible defect in email.exe re: sent timestamp) |
Message-ID: | <20150108152638.GQ4190@calimero.vinschen.de> |
Reply-To: | cygwin AT cygwin DOT com |
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References: | <003701d01ba3$a444b5d0$ecce2170$@belarc.com> <54947202 DOT 3010007 AT t-online DOT de> <20150107215004 DOT GC4190 AT calimero DOT vinschen DOT de> |
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--+S4DbcR7QPeSsP0V Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Jan 7 22:50, Corinna Vinschen wrote: > Hi Christian, >=20 >=20 > thanks for the testcase! >=20 > On Dec 19 19:44, Christian Franke wrote: > > $ cat strftest.c > > #include <time.h> > > #include <stdio.h> > > #include <stdlib.h> > >=20 > > int main(int argc, char **argv) > > { > > time_t t =3D (argc > 1 ? atol(argv[1]) : time(NULL)); > > struct tm *tm =3D localtime(&t); > > char buf[100]; > > strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S %z (%Z)", tm); > > printf("%s\n", buf); > > return 0; > > } > >=20 > > $ gcc -o strftest strftest.c > >=20 > > $ echo $TZ > > Europe/Berlin > >=20 > > $ ./strftest 1419010000 > > 2014-12-19 18:26:40 +0200 (CET) > >=20 > > $ ./strftest 1436200000 > > 2015-07-06 18:26:40 +0053 (CEST) >=20 > Surprisingly this is an old problem which exists in this form since 2011. > Weird that nobody noticed it so far. Or I missed earlier bug reports :} > The underlying cause was that the info for std and dst offsets was taken > from the wrong spot in the file. The weird 0053 offset is a result of > wrongly using the LMT offset for Europe/Berlin. >=20 > While this fixes the problem for recent timestamps, it will probably > fail for older timestamps when other dst rules were active. >=20 > The latest Cygwin versions come with an extended struct tm which adds > members tm_offset and tm_zone for newly built applications. I'm working > on a patch so strftime utilizes these members if they are available. > I hope to get this finished tomorrow. I uploaded a snapshot containing the fixes in tzload and strftime to https://cygwin.com/snapshots/ Please give it a try. Thanks, Corinna --=20 Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Maintainer cygwin AT cygwin DOT com Red Hat --+S4DbcR7QPeSsP0V Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBAgAGBQJUrqGuAAoJEPU2Bp2uRE+gd0gP+gOLyzOkheBw6SEYDMfQ8ka2 Qc8hMU/xzoFCwrkBVidlwHMB0CvLT2uo1ag8BQyX54WJIpQN76XMi79v6j3g3KM5 65deVFMPQSSEbMRSg4unEQfdI2/btUaoPwLL/07bxDstAWsyz2MkyFcYwzpGV1OT du5F3ZmzEBRQKcYQ1gPCZ+aYZ/E0vD60BClWv2+lILQ1+aO3/xgy5Hrxh5sqlr/S C9kvez4KNvM+r8cT1k8S5cK92zQO7ySC+C9gCTzE8ydqTksJeY22RcWQwrOaDg5G IRjYMoCViA0f0Ee00du3lYGwAGfAF6tDwWf2mBuCBClvhO22NIYorTnOjNTWL8Bk 7vJYeg/hNrO20SkI4+wOOyzY0e3JJ97kKl+OLNfQuY0Nczwc4gEPo5QVsn7ny654 TdxZuU81Et5HoP/PpL6v2y0+pt4J2jIWSHuI4LprgbYt63eW1Zg9b9JJu2lnMVXA n1Egvd00AGcRw+ZKqyPoZKjZIRj2eXVrnKBaDCUwqonwzF2shoHN9LQaIGU/yHba fgDsEAPn0TrXWYxgDlFoEALKeBBg4q53en5bqAEi4rcAD5MDdqu8EGCLYE3U3WDA 9PZZCEKe6hVjyLHHqkdR3yCEeY7YBWYiSnHJNAuqfZVe8Gz8tyYfnd83K0RRxmwP Q0qbyHW8cCE7kc7FIYcm =vquz -----END PGP SIGNATURE----- --+S4DbcR7QPeSsP0V--
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