The thing to remember is that there aren't fixed offsets for all these thanks to daylight saving time (which may vary as to whether it's applied, which hemisphere-style it's applied to, when it enters and leaves,
see ref [3a] for this
etc
Brion,
- thanks (also for enotif message texts refurbishing)
It is clear, that the most difficult thing is to get the current dates (and time-of-dates) when DST actually changes. In my bugzilla, everything has been said, especially about the (very) problems with the DST - I posted numerous updates (this has come to an end now, because I have all the needed information at hand)
[0] http://bugzilla.wikipedia.org/show_bug.cgi?id=505 Ref [3a] in [0] = http://www.worldtimezone.com/daylight.html