[R] Daylight Saving Time

Prof Brian Ripley ripley at stats.ox.ac.uk
Fri Nov 7 16:56:18 CET 2014 

On 07/11/2014 10:21, Vasantha Kumar Kesavan wrote:
> I am Sorry for not explained my requirement to you properly.
>
> As you told in Windows I need to update the $R_HOME/share/zoneinfo with the
> latest time zone information, since R is not using the operating system
> time zone files. Then I have updated the zoneinfo directory, after that it
> is working fine for me in the windows.
>
> In the linux platform by default R is using the operating system timezone
> files available at "/usr/share/zoneinfo" path. Yesterday my question was is
> it there are any way to configure the R to use different path
> ("/tmp/zoneinfo") instead of "/usr/share/zoneinfo".
>
> Then from the internet I came to know that the TZDIR

Well, it is in the R help file: give credit where it is due!

> (TZDIR="/tmp/zoneinfo") environment variable can be used for configure
> different time zone path instead of the default path. By setting the TZDIR
> environment variable in Linux does the need as I am expected. So my
> requirement in Windows and Linux platform are worked out.
>
> Now I like to know, how to do the same in Solaris operating system (when I
> am tried with setting TZDIR environment variable as like Linux but no luck).

Go back to the R manuals: the recommendation for recent R on Solaris is 
to use the tzcode included in R, for which TZDIR does work.

We can write the help and manuals for you, but it is your responsibility 
to do your own homework: see the posting guide.

>
> Thanks
> Vasanth
>
>
>
> On Fri, Nov 7, 2014 at 2:55 AM, Jeff Newmiller <jdnewmil at dcn.davis.ca.us>
> wrote:
>
>> ?timezones
>>
>> You probably need to recompile R.
>> ---------------------------------------------------------------------------
>> 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.
>>
>> On November 6, 2014 4:10:58 PM EST, Vasantha Kumar Kesavan <
>> info.vasukv at gmail.com> wrote:
>>> In LINUX, I don't want R to use the operating system zoneinfo(Olsen
>>> database) instead of that I like to point different path which has the
>>> latest zoneinfo(latest Olsen database).
>>>
>>> On Fri, Nov 7, 2014 at 2:34 AM, Jeff Newmiller
>>> <jdnewmil at dcn.davis.ca.us>
>>> wrote:
>>>
>>>> Working now... after what action?
>>>>
>>>> AFAIK on *NIX systems R uses the OS installation of the Olsen
>>> database, so
>>>> on a fresh login R should pick up any OS update you have installed.
>>>>
>>
>>> ---------------------------------------------------------------------------
>>>> 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.
>>>>
>>>> On November 6, 2014 3:36:38 PM EST, Vasantha Kumar Kesavan <
>>>> info.vasukv at gmail.com> wrote:
>>>>> Thanks Jeff Newmiller, it is working now.
>>>>>
>>>>> I would like to know, the same kind of configuration can be done in
>>>>> Linux
>>>>> and Solaris platform.
>>>>>
>>>>> Instead of R is mapping to operating system(/usr/share/.
>>>>> /usr/share/lib/)
>>>>> zoneinfo directory.
>>>>>
>>>>> Thanks
>>>>> Vasanth
>>>>>
>>>>> On Fri, Nov 7, 2014 at 1:18 AM, Jeff Newmiller
>>>>> <jdnewmil at dcn.davis.ca.us>
>>>>> wrote:
>>>>>
>>>>>> R on Windows uses the Olsen timezone database, a copy of which is
>>>>> stored
>>>>>> with R in the Program Files directory (e.g.
>>>>> R/R-3.1.1/share/zoneinfo). You
>>>>>> could update the file yourself if you can find a corrected
>>> version,
>>>>> or
>>>>>> download an updated version of R.
>>>>>>
>>>>
>>>>
>>
>>>> ---------------------------------------------------------------------------
>>>>>> 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.
>>>>>>
>>>>>> On November 6, 2014 1:16:06 PM EST, Vasantha Kumar Kesavan <
>>>>>> info.vasukv at gmail.com> wrote:
>>>>>>> Hi,
>>>>>>>
>>>>>>> I am working R on windows 2012 R2 platform, I have updated the
>>>>> latest
>>>>>>> hotfixes for time zone information(Microsoft KB 2981580.
>>>>>>> <http://support.microsoft.com/kb/2981580>).
>>>>>>>
>>>>>>> But still R is not populating correct date time values(Standard
>>> and
>>>>>>> Daylight saving).
>>>>>>>
>>>>>>> Could you please advise me, how to enable R to pick up the latest
>>>>> time
>>>>>>> zone
>>>>>>> information/configurations.
>>>>>>>
>>>>>>> Example:
>>>>>>>
>>>>>>> R --vanilla
>>>>>>> Sys.setenv(TZ = "America/Eirunepe");
>>>>>>> dt<-c(seq(as.POSIXct("2013-11-09
>>> 20:00:00",tz="America/Eirunepe"),
>>>>>>> as.POSIXct("2013-11-10 10:00:00" ,tz="America/Eirunepe"),
>>>>> by="hour"));
>>>>>>>> dt
>>>>>>> [1] "2013-11-09 20:00:00 AMT" "2013-11-09 21:00:00 AMT"
>>>>>>> [3] "2013-11-09 22:00:00 AMT" "2013-11-09 23:00:00 AMT"
>>>>>>> [5] "2013-11-10 00:00:00 AMT" "2013-11-10 01:00:00 AMT"
>>>>>>> [7] "2013-11-10 02:00:00 AMT" "2013-11-10 03:00:00 AMT"
>>>>>>> [9] "2013-11-10 04:00:00 AMT" "2013-11-10 05:00:00 AMT"
>>>>>>> [11] "2013-11-10 06:00:00 AMT" "2013-11-10 07:00:00 AMT"
>>>>>>> [13] "2013-11-10 08:00:00 AMT" "2013-11-10 09:00:00 AMT"
>>>>>>> [15] "2013-11-10 10:00:00 AMT"
>>>>>>>
>>>>>>> For the “*America/Eirunepe*” time zone, the DST ended on Sun
>>>>>>> 10-Nov-2013 at
>>>>>>> 12:00:00 A.M. when local clocks were set backward 1 hour.
>>>>>>>
>>>>>>>
>>>>>>> as per the latest timezone configuration, the date time sequence
>>>>> should
>>>>>>> have "2013-11-09 23:00:00" twice.
>>>>>>>
>>>>>>>
>>>>>>> Thanks
>>>>>>>
>>>>>>> Vasanth
>>>>>>>
>>>>>>>        [[alternative HTML version deleted]]
>>>>>>>
>>>>>>> ______________________________________________
>>>>>>> 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.
>>>>>>
>>>>>>
>>>>
>>>>
>>
>>
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> 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.
>


-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford
1 South Parks Road, Oxford OX1 3TG, UK

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