[R] Problem with GMT+/- time zones

Jeff Newmiller jdnewmil at dcn.davis.ca.us
Thu Feb 2 08:46:53 CET 2012


Should has nothing to do with it. That is the way the Olsen tz database works.  See en.wikipedia.org/wiki/Tz_database.
---------------------------------------------------------------------------
Jeff Newmiller                        The     .....       .....  Go Live...
DCN:<jdnewmil at dcn.davis.ca.us>        Basics: ##.#.       ##.#.  Live Go...
                                      Live:   OO#.. Dead: OO#..  Playing
Research Engineer (Solar/Batteries            O.O#.       #.O#.  with
/Software/Embedded Controllers)               .OO#.       .OO#.  rocks...1k
--------------------------------------------------------------------------- 
Sent from my phone. Please excuse my brevity.

Andrew Digby <andrewdigby at mac.com> wrote:

>
>I'm struggling with time zone version when expressed as hours offset
>from GMT. Can anyone confirm that the behaviour below is incorrect? It
>seems that the GMT offsets are backwards:
>
>> format(as.POSIXct("2011-05-23 17:23:00",
>tz="Europe/London"),tz="America/New_York",usetz=T)
>[1] "2011-05-23 12:23:00 EDT"
>
>- this works.
>
>> format(as.POSIXct("2011-05-23 17:23:00",tz="GMT"),tz="GMT-5",usetz=T)
>[1] "2011-05-23 22:23:00 GMT"
>
>- this doesn't work: 17:23:00 GMT should be 12:23:00 GMT-5!
>
>
>Thanks.
>
>
>R version 2.13.0 (2011-04-13)
>Platform: x86_64-apple-darwin9.8.0/x86_64 (64-bit)
>
>______________________________________________
>R-help at r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.



More information about the R-help mailing list