[R] Problem with GMT+/- time zones

Andrew Digby andrewdigby at mac.com
Thu Feb 2 03:24:58 CET 2012


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)



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