On Fri, Apr 23, 2004 at 11:30:19AM -0700, Vadim Ogranovich wrote:
> Hi,
>
> I have two data sources. One records time in PST time zone, the other in
> GMT. I want to compute the difference between the two, but don't see
> how. Here is an example where I compute time difference between
> identical times each (meant to be) relative to its time zone.
>
> > as.POSIXlt("2000-05-10 10:15:00", "PST") - as.POSIXlt("2000-05-10
> 10:15:00", "GMT")
> Time difference of 0 secs
>
> I was expecting to see 8hrs (which is the time difference between London
> and San-Francisco). Why is it so and what is the correct way of doing
> it?
Seems to work with POSIXct in 1.8.1 and 1.9.0:
> as.POSIXct("2000-05-10 10:15:00", "PST8PDT") - as.POSIXct("2000-05-10
10:15:00", tz="UTC")
Time difference of 7 hours
Dirk
>
>
> I use R-1.8.1 on RH-7.3.
>
> Thanks,
> Vadim
>
>
>
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>
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