[Rd] POSIX problem in New Zealand (PR#2570)

ripley@stats.ox.ac.uk ripley@stats.ox.ac.uk
Fri Feb 21 08:17:03 2003


What exactly is the problem?  Those appear to be the same time, in 
different time zones.  Is the problem that you are in the N Hemisphere
(your email address is) trying to use S Hemisphere times on an OS
that does not support pre-1970 times?

You seem to be confusing the time and how it is printed.  What do you 
want to do with these times?

On Fri, 21 Feb 2003 arnima@u.washington.edu wrote:

> Full_Name: Arni Magnusson
> Version: 1.6.2
> OS: Windows XP
> Submission from: (NULL) (210.48.49.68)
> 
> 
> Hi there. I'm experiencing unexpected behaviour from as.POSIXct:
> 
> > as.POSIXct("1969-12-24")
> [1] "1969-12-23 23:00:00 New Zealand Standard Time"
> > as.POSIXlt("1969-12-24")
> [1] "1969-12-24"
> > as.POSIXlt("1969-12-24")+1
> [1] "1969-12-23 23:00:01 New Zealand Standard Time"
> 
> 
> My friend on the US West Coast tells me he has not encountered this problem.
> I've read some of the glibc discussion, but I believe that's not relevant for
> Windows XP. I also read that tz="GMT" could circumvent some problems, but not
> mine:
> 
> > as.POSIXct("1969-12-24 12:00:00", "GMT")
> [1] "1969-12-25 New Zealand Standard Time"

That's correct.  You need to *print* in GMT too.

> If I can get around this problem, I'd prefer using POSIX rather than the date or
> chron classes. Perhaps a Windows environment variable is the key?

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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