# Re: [R] question about date's

From: Richard van Wingerden <ros110_at_gmail.com>
Date: Tue 13 Dec 2005 - 00:40:32 EST

this is what I was looking for!
many many thanks!

regards,
richard

On 12/12/05, Prof Brian Ripley <ripley@stats.ox.ac.uk> wrote:
> On Mon, 12 Dec 2005, ronggui wrote:
>
> >> x<-as.Date(c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05"))
> >> weekdays(x)
> > [1] "星期五" "星期六" "星期日" "星期一" "星期二"
> >
> >> months(x)
> > [1] "七月" "七月" "七月" "七月" "七月"
>
>
> He asked for week numbers. That's nothing like as easy, as it is not
> well-defined. But
>
> > strftime(as.POSIXlt(x), "%U")
> [1] "26" "26" "27" "27" "27"
>
> is one possibility ("%W" is another). This approach will do the other
> requests just as easily.
>
> > ======= 2005-12-12 20:17:38 您在来信中写道：=======
> >
> >> Thanks!
> >> That solves my problem for year numbers and month numbers
> >> Any idea how to do this for week numbers?
> >>
> >> Regards,
> >> Richard
> >>
> >> On 12/12/05, ronggui <042045003@fudan.edu.cn> wrote:
> >>> This is one way to do it.
> >>>> x<-c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05")
> >>>> x
> >>> [1] "2005-07-01" "2005-07-02" "2005-07-03" "2005-07-04" "2005-07-05"
> >>>> substr(x,1,4)
> >>> [1] "2005" "2005" "2005" "2005" "2005"
> >>>> substr(x,6,7)
> >>> [1] "07" "07" "07" "07" "07"
> >>>> substr(x,9,10)
> >>> [1] "01" "02" "03" "04" "05"
> >>>>
> >>>
> >>>
> >>> ======= 2005-12-12 20:06:00 您在来信中写道：=======
> >>>
> >>>> Hi,
> >>>>
> >>>> Given a frame with calendar date's:
> >>>>
> >>>> "2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05",etc.
> >>>>
> >>>> I want to extract the following from these dates:
> >>>>
> >>>> week number
> >>>> month number
> >>>> year number
> >>>>
> >>>> Any ideas how to accomplish this?
> >>>>
> >>>> Many thanks.
> >>>>
> >>>> Regards,
> >>>> Richard
> >>>>
> >>>> ______________________________________________
> >>>> R-help@stat.math.ethz.ch mailing list
> >>>> https://stat.ethz.ch/mailman/listinfo/r-help
> >>>
> >>> = = = = = = = = = = = = = = = = = = = =
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> 2005-12-12
> >>>
> >>> ------
> >>> Deparment of Sociology
> >>> Fudan University
> >>>
> >>> My new mail addres is ronggui.huang@gmail.com
> >>> Blog:http://sociology.yculblog.com
> >>>
> >
> > = = = = = = = = = = = = = = = = = = = =
> >
> >
> >
> >
> >
> > 2005-12-12
> >
> > ------
> > Deparment of Sociology
> > Fudan University
> >
> > My new mail addres is ronggui.huang@gmail.com
> > Blog:http://sociology.yculblog.com
> >
> >
>
> --
> Brian D. Ripley, ripley@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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