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* [Bug libc/14606] New: lost 1h in gmtime, ctime extracted date
@ 2012-09-22 8:55 eugene.kopyshev at gmail dot com
2012-09-22 9:28 ` [Bug libc/14606] " schwab@linux-m68k.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: eugene.kopyshev at gmail dot com @ 2012-09-22 8:55 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14606
Bug #: 14606
Summary: lost 1h in gmtime, ctime extracted date
Product: glibc
Version: 2.11
Status: NEW
Severity: normal
Priority: P2
Component: libc
AssignedTo: unassigned@sourceware.org
ReportedBy: eugene.kopyshev@gmail.com
CC: drepper.fsp@gmail.com
Classification: Unclassified
Every year, random day in Oct, ctime resolves two different epoch times into
the same string date. tz not set, not affected, not makes an influence. For
example:
1351385541 2012-10-28 1:52:21 Sun Oct 28 01:52:21 2012
1351389141 2012-10-28 1:52:21 Sun Oct 28 01:52:21 2012
A code to get output as above:
#include<time.h>
#include<stdio.h>
int main()
{
time_t t;
struct tm *tm;
t=1351385541;
tm=gmtime(&t);
printf( "%lu %d-%d-%d %d:%d:%d %s", t, tm->tm_year+1900, tm->tm_mon+1,
tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, ctime(&t) );
t=1351389141;
tm=gmtime(&t);
printf( "%lu %d-%d-%d %d:%d:%d %s", t, tm->tm_year+1900, tm->tm_mon+1,
tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec, ctime(&t) );
}
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* [Bug libc/14606] lost 1h in gmtime, ctime extracted date
2012-09-22 8:55 [Bug libc/14606] New: lost 1h in gmtime, ctime extracted date eugene.kopyshev at gmail dot com
@ 2012-09-22 9:28 ` schwab@linux-m68k.org
2012-09-22 10:09 ` eugene.kopyshev at gmail dot com
2014-06-17 4:23 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: schwab@linux-m68k.org @ 2012-09-22 9:28 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14606
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |INVALID
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2012-09-22 09:26:58 UTC ---
The dates are in different time zones, crossing a DST changeover. See
tm_isdst.
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* [Bug libc/14606] lost 1h in gmtime, ctime extracted date
2012-09-22 8:55 [Bug libc/14606] New: lost 1h in gmtime, ctime extracted date eugene.kopyshev at gmail dot com
2012-09-22 9:28 ` [Bug libc/14606] " schwab@linux-m68k.org
@ 2012-09-22 10:09 ` eugene.kopyshev at gmail dot com
2014-06-17 4:23 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: eugene.kopyshev at gmail dot com @ 2012-09-22 10:09 UTC (permalink / raw)
To: glibc-bugs
http://sourceware.org/bugzilla/show_bug.cgi?id=14606
--- Comment #2 from Eugene Kopyshev <eugene.kopyshev at gmail dot com> 2012-09-22 10:09:10 UTC ---
Hi Andreas,
Right, but with tm.tm_isdst=0 it works for all "modern" dates and fails
somewhen before the 19xx. Changeover did not exist then?
57718800 Sun Oct 31 02:00:00 1971
57722400 Sun Oct 31 02:00:00 1971
With tm_isdst=-1 it does not work for any year. In case with http server
application is makes tricky to cover past dates... ok, nobody needs it,
hopefully.
Thanka s lot!
2012/9/22 schwab@linux-m68k.org <sourceware-bugzilla@sourceware.org>
>
> http://sourceware.org/bugzilla/show_bug.cgi?id=14606
>
> Andreas Schwab <schwab@linux-m68k.org> changed:
>
> What |Removed |Added
>
> ----------------------------------------------------------------------------
> Status|NEW |RESOLVED
> Resolution| |INVALID
>
> --- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> 2012-09-22
> 09:26:58 UTC ---
> The dates are in different time zones, crossing a DST changeover. See
> tm_isdst.
>
> --
> Configure bugmail: http://sourceware.org/bugzilla/userprefs.cgi?tab=email
> ------- You are receiving this mail because: -------
> You reported the bug.
>
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* [Bug libc/14606] lost 1h in gmtime, ctime extracted date
2012-09-22 8:55 [Bug libc/14606] New: lost 1h in gmtime, ctime extracted date eugene.kopyshev at gmail dot com
2012-09-22 9:28 ` [Bug libc/14606] " schwab@linux-m68k.org
2012-09-22 10:09 ` eugene.kopyshev at gmail dot com
@ 2014-06-17 4:23 ` fweimer at redhat dot com
2 siblings, 0 replies; 4+ messages in thread
From: fweimer at redhat dot com @ 2014-06-17 4:23 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=14606
Florian Weimer <fweimer at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Flags| |security-
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end of thread, other threads:[~2014-06-17 4:23 UTC | newest]
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2012-09-22 8:55 [Bug libc/14606] New: lost 1h in gmtime, ctime extracted date eugene.kopyshev at gmail dot com
2012-09-22 9:28 ` [Bug libc/14606] " schwab@linux-m68k.org
2012-09-22 10:09 ` eugene.kopyshev at gmail dot com
2014-06-17 4:23 ` fweimer at redhat dot com
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