Thanks for confirming that it's a wider problem. I thought that /etc/localtime
on my machine was the Olsen database, but presumably not, since the DST changes
are correct in that file. Unless R is reading that file incorrectly?
I've ended up using chron (which ignores time zones and DST) and a custom DST
file as a workaround.
Thanks again.
On 7/12/2012, at 11:20 , Jeff Newmiller <jdnew...@dcn.davis.ca.us> wrote:
> I see this discontinuity at '2010-04-04 02:26:05' on my Windows 7 x64 with R
> 2.15.2. I also see it for time zone "America_Los_Angeles" at '2010-11-07
> 01:23:09'.
>
> I am not entirely sure what the "correct" behavior should be, since the
> string does not specify whether it is in daylight or standard time, even
> though it could be either for any time between 2:00 and 3:00 (or 1:00 and
> 2:00 for "America/Los_Angeles").
>
> In any event, if this is an issue it appears to be an Olsen timezone database
> issue, not an R issue.
> ---------------------------------------------------------------------------
> Jeff Newmiller The ..... ..... Go Live...
> DCN:<jdnew...@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.
>
> Andrew Digby <andrewdi...@mac.com> wrote:
>
>>
>> Apologies - I intended to add that info at the end: OS X 10.8.2 and R
>> 2.15.1.
>>
>> Many thanks.
>>
>>> R.Version()
>> $platform
>> [1] "x86_64-apple-darwin9.8.0"
>> $arch
>> [1] "x86_64"
>> $os
>> [1] "darwin9.8.0"
>> $system
>> [1] "x86_64, darwin9.8.0"
>> $status
>> [1] ""
>> $major
>> [1] "2"
>> $minor
>> [1] "15.1"
>> $year
>> [1] "2012"
>> $month
>> [1] "06"
>> $day
>> [1] "22"
>> $`svn rev`
>> [1] "59600"
>> $language
>> [1] "R"
>> $version.string
>> [1] "R version 2.15.1 (2012-06-22)"
>> $nickname
>> [1] "Roasted Marshmallows"
>>
>>
>> On 7/12/2012, at 04:29 , Uwe Ligges <lig...@statistik.tu-dortmund.de>
>> wrote:
>>
>>>
>>>
>>> On 06.12.2012 15:54, Jeff Newmiller wrote:
>>>> What OS are you using? It makes a difference.
>>>
>>> ... and R version.
>>>
>>> Uwe Ligges
>>>
>>>>
>> ---------------------------------------------------------------------------
>>>> Jeff Newmiller The ..... ..... Go
>> Live...
>>>> DCN:<jdnew...@dcn.davis.ca.us> Basics: ##.#. ##.#.
>> Live Go...
>>>> Live: OO#.. Dead: OO#..
>> Playing
>>>> Research Engineer (Solar/Batteries O.O#. #.O#.
>> with
>>>> /Software/Embedded Controllers) .OO#. .OO#.
>> rocks...1k
>>>>
>> ---------------------------------------------------------------------------
>>>> Sent from my phone. Please excuse my brevity.
>>>>
>>>> Andrew Digby <andrewdi...@mac.com> wrote:
>>>>
>>>>>
>>>>> Can anyone please shed any light on why R DateTimeClasses give
>> weird
>>>>> times for when daylight saving time information changes, and which
>>>>> aren't consistent with the OS?
>>>>>
>>>>> Example:
>>>>>
>>>>> Expected result: in New Zealand DST stopped (NZDT -> NZST) at
>> 03:00
>>>>> NZDT on 2010-04-04, as confirmed by the OS time zone info (OS X
>>>>> 10.8.2):
>>>>>
>>>>> zdump -v /etc/localtime
>>>>> /etc/localtime Sat Apr 3 13:59:59 2010 UTC = Sun Apr 4
>> 02:59:59
>>>>> 2010 NZDT isdst=1
>>>>> /etc/localtime Sat Apr 3 14:00:00 2010 UTC = Sun Apr 4
>> 02:00:00
>>>>> 2010 NZST isdst=0
>>>>>
>>>>> Result in R: R has DST changing at 02:26:08, instead of 03:00!
>>>>>
>>>>> > a<-as.POSIXlt('2010-04-04 02:26:07',tz="NZ")
>>>>> > a$isdst
>>>>> [1] 1
>>>>> > b<-as.POSIXlt('2010-04-04 02:26:08',tz="NZ")
>>>>> > b$isdst
>>>>> [1] 0
>>>>>
>>>>>
>>>>> So does R get its DST information from somewhere else? Any
>> suggestions
>>>>> would be much appreciated!
>>>>>
>>>>> Thanks
>>>>>
>>>>> [[alternative HTML version deleted]]
>>>>>
>>>>> ______________________________________________
>>>>> R-help@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@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.
>>>>
>
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