[R] Problem in Dates

[Gabor Grothendieck]

Read R News 4/1 help desk article and the last line of every message to r-help.
Also putting POSIXlt objects into data frames is asking for trouble.

On 12/19/06, Shubha Karanth <shubhakaranth at gmail.com> wrote:
> Hi Experts,
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>
> I have a problem in Dates.
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> I have a zoo object called 'intra'. And the class of index(intra) is
> ("Chron" "Dates" "Time"). I need to put the index of this zoo object into a
> data frame. So I used,
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> idat<-data.frame(Datetime=as.POSIXlt(index(intra),"GMT"))
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> But I get the values of 'idat' to be:
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> "01joulu2006 09:59:59"
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> "01joulu2006 10:09:59"
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> "01joulu2006 10:19:59"
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> "01joulu2006 10:30:00"
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> "01joulu2006 10:40:00"
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> "01joulu2006 10:50:00"
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>
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> But I need the 'idat' format to be:
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> 2006-12-01 13:30:00
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> 2006-12-01 13:40:00
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> 2006-12-01 13:50:00
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> 2006-12-01 14:00:00
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> 2006-12-01 14:10:00
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> 2006-12-01 14:19:59
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> 2006-12-01 14:29:59
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> i.e., instead of joulu (The finnish version of December) I need to get in
> the number format. How do I do this? Do I need to change the OS date format?
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> Because I read a documentation which says "Unfortunately, the documentation
> of POSIXt objects is Operating system dependent and especially under MS
> Windows several problems appear in the management of time zones and day
> light saving times" (Source: R Documentation, timeDate Class). Thought this
> may help you…
>
>
>
> Thank you,
>
> Shubha.
>
>        [[alternative HTML version deleted]]
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