I forgot:
sysname
release
"Linux"
"3.5.0-48-generic"
version
"#72-Ubuntu SMP Mon Mar 10 23:18:29 UTC 2014"
2014-04-19 14:03 GMT+02:00 Nicola Sturaro Sommacal <
mailingl...@nicolasturaro.com>:
> Thank you for your reply.
>
> I discovered the OlsonNames() function to get the time-zone names in my
> system. Rui get a warning message when using a not recognized tz. On my
> system this doesn't succed.
>
> I solved as follow:
>
> dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
> "Europe/Rome")
>
> dt2 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
> "America/Los_Angeles")
>
> dt1[1] "2014-04-18 09:00:00 CEST"dt2
> [1] "2014-04-18 09:00:00 PDT"dt1-dt2Time difference of -9 hours
>
>
> Thank you,
> Nicola
>
>
>
> 2014-04-18 21:59 GMT+02:00 Prof Brian Ripley <rip...@stats.ox.ac.uk>:
>
> On 18/04/2014 19:46, Rui Barradas wrote:
>>
>>> Hello,
>>>
>>> The reason why is that you've misspelled CET (not CEST)
>>>
>>
>> Neither CET nor CEST are portable time-zone names. We have not been
>> given the 'at a minimum' information required by the posting guide, so
>> please read ?Sys.timezone on your system.
>>
>>
>>
>>
>>> > dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
>>> "CEST")
>>> Warning messages:
>>> 1: In strptime(x, format, tz = tz) : unknown timezone 'CEST'
>>> 2: In as.POSIXct.POSIXlt(as.POSIXlt(x, tz, ...), tz, ...) :
>>> unknown timezone 'CEST'
>>> > dt2 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
>>> "GMT")
>>> > dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
>>> "CET")
>>> > dt1-dt2
>>> Time difference of -2 hours
>>>
>>>
>>> Hope this helps,
>>>
>>> Rui Barradas
>>>
>>> Em 18-04-2014 17:13, Nicola Sturaro Sommacal escreveu:
>>>
>>>> Hi.
>>>>
>>>> I am new to POSIX and I'd like to understand the reason of this
>>>> difference.
>>>>
>>>> dt1 = as.POSIXct("2014-03-29 09.00", format="%Y-%m-%d %H.%M")
>>>> dt2 = as.POSIXct("2014-03-30 09.00", format="%Y-%m-%d %H.%M")
>>>> dt2-dt1
>>>>
>>>> dt1[1] "2014-03-29 09:00:00 CET"> dt2[1] "2014-03-30 09:00:00 CEST">
>>>>> dt2-dt1
>>>>>
>>>>
>>>> Time difference of 23 hours
>>>>
>>>> This is right, because on Mar 31 at 2 PM we jump directly to 3PM, DST.
>>>>
>>>> On the contrary, I don't understand the following:
>>>>
>>>> dt1 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
>>>> "CEST")
>>>> dt2 = as.POSIXct("2014-04-18 09.00", format="%Y-%m-%d %H.%M", tz =
>>>> "GMT")
>>>>
>>>> dt1[1] "2014-04-18 09:00:00 CEST"> dt2[1] "2014-04-18 09:00:00 GMT">
>>>>> dt1-dt2Time difference of 0 secs
>>>>>
>>>>
>>>>
>>>> I should expected a time difference of 2 hours, as CEST is GMT+2.
>>>>
>>>> Anyone can help me?
>>>>
>>>> Thank you,
>>>> Nicola
>>>>
>>>> [[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.
>>>
>>
>>
>> --
>> Brian D. Ripley, rip...@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)
>> Oxford OX1 3TG, UK Fax: +44 1865 272595
>>
>
>
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