[R] Fwd: as.POSIXlt() Function

[David Winsemius]

On Oct 22, 2014, at 7:46 PM, Jeff Newmiller wrote:

> Because PST8PDT probably is not a valid TZ on your operating system. Try "America/LosAngeles"

For me (on a Mac) it has an intervening dash:

> Sys.timezone(location = TRUE)
[1] "America/Los_Angeles"

However, on a mac the system returns a differnt results:

>  Sys.getenv("TZ")
[1] ""

-- 
David.

> ---------------------------------------------------------------------------
> Jeff Newmiller                        The     .....       .....  Go Live...
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> 
> On October 22, 2014 2:35:55 AM PDT, Vasantha Kumar Kesavan <info.vasukv at gmail.com> wrote:
>> Hi,
>> 
>> I am a new R user and also not sure about the below concern is really a
>> bug,
>> 
>> My concern are listed below,
>> 
>> Look at the below example, when Sys.Date () is called within the
>> as.POSIXlt
>> () function. Why it is displaying only the date value and the timezone
>> is
>> selected to UTC even though the TZ variable is set to "PST8PDT".  I
>> could
>> not see this kind of behavior with as.POSIXct () function.
>> 
>> This is happening in both LINUX 32 and 64 bit operating system.
>> 
>> 
>> Example:
>> 
>>> version
>>              _
>> platform       i386-redhat-linux-gnu
>> arch           i386
>> os             linux-gnu
>> system         i386, linux-gnu
>> status
>> major          2
>> minor          10.0
>> year           2009
>> month          10
>> day            26
>> svn rev        50208
>> language       R
>> version.string R version 2.10.0 (2009-10-26)
>>> Sys.setenv(TZ="PST8PDT");
>>> Sys.setenv(ORA_SDTZ="PST8PDT");
>>> 
>>> Sys.getenv("TZ");
>>      TZ
>> "PST8PDT"
>>> Sys.getenv("ORA_SDTZ");
>> ORA_SDTZ
>> "PST8PDT"
>>> 
>>> as.POSIXct(Sys.Date());
>> [1] "2014-10-20 17:00:00 PDT"
>>> c(as.POSIXct(Sys.Date()));
>> [1] "2014-10-20 17:00:00 PDT"
>>> 
>>> as.POSIXlt(Sys.Date());
>> [1] "2014-10-21 UTC"
>>> c(as.POSIXlt(Sys.Date()));
>> [1] "2014-10-20 17:00:00 PDT"
>>> 
>>> as.POSIXct(Sys.time());
>> [1] "2014-10-21 20:59:23 PDT"
>>> c(as.POSIXct(Sys.time()));
>> [1] "2014-10-21 20:59:23 PDT"
>>> 
>>> as.POSIXlt(Sys.time());
>> [1] "2014-10-21 20:59:23 PDT"
>>> c(as.POSIXlt(Sys.time()));
>> [1] "2014-10-21 20:59:23 PDT"
>>> 
>> 
>> 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.
> 
> ______________________________________________
> 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.

David Winsemius
Alameda, CA, USA