On Monday 10 November 2008 01:23:30 pm Prof Brian Ripley wrote:
> See ?Sys.timezone, which help.search("timezone") points you to.
>
> On Mon, 10 Nov 2008, stephen sefick wrote:
> > I have looked at
> > ?as.POSIXct
>
> That also links to Sys.timezone from the 'tz' argument.
>
> > ?POSIXct
> > and many of the references that are on those pages.
> >
> > I am bewildered with timezones.  Is there a way to get what would go
> > into tz="" for making a function that uses POSIXct to be able to be
> > used in all of the timezones in just the united states?  This is for
> > both windows and mac...
>
> There are rather a lot of timezones in the United States (sic), down to
> individual counties.
>
There are six: Eastern Standard (UTC-5), Central Standard (UTC-6), Mountain 
Standard (UTC-7), Pacific Standard (UTC-8), Alaskan (UTC-9) and Hawaiian-
Aleutian (UTC-10).  Daylight Savings Time, a stupid institution, is not 
observed by a sizeable piece of Arizona (most of the state, though apparently 
the Navaho DO observe it, while the Hopi do not) and Hawaii.

John Dougherty




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