[Bug libc/4033] mktime bug in Europe/Lisbon timezone

["jakub at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From jakub at redhat dot com  2007-02-22 15:52 -------
FYI, that time isn't actually a DST switch, but just switching the GMT offset
of the timezone for non-DST time:
Europe/Lisbon  Sun Oct  3 01:59:59 1965 UTC = Sun Oct  3 02:59:59 1965 WEST
isdst=1 gmtoff=3600
Europe/Lisbon  Sun Oct  3 02:00:00 1965 UTC = Sun Oct  3 02:00:00 1965 WET
isdst=0 gmtoff=0
Europe/Lisbon  Sun Apr  3 01:59:59 1966 UTC = Sun Apr  3 01:59:59 1966 WET
isdst=0 gmtoff=0
Europe/Lisbon  Sun Apr  3 02:00:00 1966 UTC = Sun Apr  3 03:00:00 1966 WET
isdst=0 gmtoff=3600
Europe/Lisbon  Sat Sep 25 23:59:59 1976 UTC = Sun Sep 26 00:59:59 1976 WET
isdst=0 gmtoff=3600
Europe/Lisbon  Sun Sep 26 00:00:00 1976 UTC = Sun Sep 26 00:00:00 1976 WET
isdst=0 gmtoff=0
Europe/Lisbon  Sat Mar 26 23:59:59 1977 UTC = Sat Mar 26 23:59:59 1977 WET
isdst=0 gmtoff=0
Europe/Lisbon  Sun Mar 27 00:00:00 1977 UTC = Sun Mar 27 01:00:00 1977 WEST
isdst=1 gmtoff=3600

As such, you can't rely on tm_isdst here to pick one or the other time,
Sep 26 00:30:00 1976 WET has ambiguous translation into seconds since epoch.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=4033

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