[R] time zones from longitude, latitude, and date

[Prof Brian Ripley]

On 21/09/2013 08:17, Gabor Grothendieck wrote:
> On Fri, Sep 20, 2013 at 4:31 PM, carlisle thacker
> <carlisle.thacker at gmail.com> wrote:
>> I was looking for something like shown on the map:
>> http://upload.wikimedia.org/wikipedia/commons/8/88/World_Time_Zones_Map.png
>>
>> Information about local daylight savings times would also help.
>>
>> The data are from ships, supposedly in local time, but no time-zone info is
>> given.  A function that would return time zone and whether or not daylight
>> savings time applies at given date would would help.  I'm trying to track
>> down more information about the data and whether they can be referenced to
>> UTC.
>
> The zone.tab file has this information.  See the Examples section at
> the end of ?Sys.timezone for info on its whereabouts.

On some OSes only.


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
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