Can anyone please shed any light on why R DateTimeClasses give weird times for
when daylight saving time information changes, and which aren't consistent with
the OS?
Example:
Expected result: in New Zealand DST stopped (NZDT -> NZST) at 03:00
NZDT on 2010-04-04, as confirmed by the OS time zone info (OS X 10.8.2):
zdump -v /etc/localtime
/etc/localtime Sat Apr 3 13:59:59 2010 UTC = Sun Apr 4
02:59:59 2010 NZDT isdst=1
/etc/localtime Sat Apr 3 14:00:00 2010 UTC = Sun Apr 4
02:00:00 2010 NZST isdst=0
Result in R: R has DST changing at 02:26:08, instead of 03:00!
> a<-as.POSIXlt('2010-04-04 02:26:07',tz="NZ")
> a$isdst
[1] 1
> b<-as.POSIXlt('2010-04-04 02:26:08',tz="NZ")
> b$isdst
[1] 0
So does R get its DST information from somewhere else? Any suggestions would be
much appreciated!
Thanks
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