Package: tzdata
Version: 2006p-1
localtime() resolves time==0 as Jan 1 1970 01:00 instead of 00:00 in
the Europe/London timezone. This was in etch; it also does this in
Debian sarge and gentoo, so I guess it's an old upstream bug.
It may be a bug in localtime() but certainly depends on the named
timezone (see below).
I'm amazed no one has spotted this before!
In fact, versions of libc/zoneinfo from 2000 (libc2.1.3) behave the same.
Is there something I'm missing here?
Repeat-by:
cat >> c.c << EOF
#include <time.h>
#include <stdio.h>
extern long timezone; /* Seconds west of gmt */
main()
{
time_t t = 0;
struct tm *tmp;
printf("Epoch in gmtime is %s", asctime(gmtime(&t)));
printf("Epoch in localtime is %s", asctime(tmp = localtime(&t)));
printf("timezone is %ld minutes east of UTC\n", -timezone/60);
printf("DST was%s in effect\n", tmp->tm_isdst ? "" : "n't");
}
EOF
$ cc c.c
$ TZ=Europe/London ./a,out # Europe/London is broken.
Epoch in gmtime is Thu Jan 1 00:00:00 1970
Epoch in localtime is Thu Jan 1 01:00:00 1970
timezone is 0 minutes east of UTC
DST wasn't in effect.
$ TZ=Europe/Paris ./a.out # Paris, on the same meridian, works ok.
Epoch in gmtime is Thu Jan 1 00:00:00 1970
Epoch in localtime is Thu Jan 1 00:00:00 1970
timezone is 0 minutes east of UTC
DST wasn't in effect
$ TZ=GMT+0 ./a.out # Absolute timezone works ok
Epoch in gmtime is Thu Jan 1 00:00:00 1970
Epoch in localtime is Thu Jan 1 00:00:00 1970
timezone is 0 minutes east of UTC
DST wasn't in effect
$ TZ=Europe/Warsaw # A location truly one hour out works ok
Epoch in gmtime is Thu Jan 1 00:00:00 1970
Epoch in localtime is Thu Jan 1 01:00:00 1970
timezone is 60 minutes east of UTC
DST wasn't in effect
Other named locations on the GMT+0 meridian may also be similarly broken.
M
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