[Development] How does mktime() handle DST transitions ?

Florian Bruhin me at the-compiler.org
Thu Nov 5 13:16:36 CET 2015

* André Somers <andre at familiesomers.nl> [2015-11-05 13:10:33 +0100]:
> Op 5-11-2015 om 00:06 schreef Kevin Kofler:
> >Welbourne Edward wrote:
> >>I'm looking into QTBUG-49008 and need to work out how diverse
> >>implementations of mktime handle DST transitions: at one end of the year
> >>there's a gap (where 1:59 is followed by 3:00), at the other end there's
> >>a duplicated hour (where 2:59 is followed by a reprise of 2:00 in
> >>Europe, or 1:59 by 1:00 in the USA, IIUC).  While we still need to work
> >>out what behaviour *we* want to give, implementing it is going to depend
> >>on knowing what the platform mktime gives us to work with.
> >The EU actually defines the switchover time in UTC, so which hour is
> >duplicated depends on the actual time zone. It's the 3:mm hour in CET/CEST.
> >
> Nonsense*. I live in the CET (Netherlands), I am 100% sure that the hour
> duplicated is the 2:mm range, not the 3:mm range. At 03:00, the time is
> reset to 02:00 entering winter time again. That happened last October 25.
> Going to summer time, the hour skipped is the 2:mm range also.

While not in the EU, I can confirm what André said for Switzerland as
well :)


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