R help - Oct 2007 - extract year or month from date

Hi,

I am having trouble extracting just the year or the month or the day from a
date such as 5/7/2007 which is May 7th 2007. Is there any particular
function to extract just the year from this format?

When I am reading this data from a text file it is reading it correctly in
the same format but does not acknowlede it as date but as a factor. If I try
as.date(5/7/2007) then it is converting it to 1Jan1960. Weird it is. Any
help on that front?

Any help is greatly appreciated.

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Read the help desk article on dates in R News 4/1.

On 10/9/07, Mary Royerr <mroyerr at gmail.com>
wrote:
> Hi,
>
> I am having trouble extracting just the year or the month or the day from a
> date such as 5/7/2007 which is May 7th 2007. Is there any particular
> function to extract just the year from this format?
>
> When I am reading this data from a text file it is reading it correctly in
> the same format but does not acknowlede it as date but as a factor. If I
try
> as.date(5/7/2007) then it is converting it to 1Jan1960. Weird it is. Any
> help on that front?
>
> Any help is greatly appreciated.
>
>        [[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.
>

Highto convert strings into date use the:"? strptime" command, it
converts data into POSIXlt classthis class provides direct access to some
details of your date time information,
likea<-strptime("07/07/1992",format="%d/%m/%Y")"a$mon+1"
gives you the month (+1 because POSIXlt uses 0-11 for months
counts)"a$year" gives you the yearMarcel Sandow----- Ursprüngliche
Nachricht -----Von: Mary Royerr Datum: Dienstag, Oktober 9, 2007 3:39 pmBetreff:
[R] extract year or month from dateAn: r-help@r-project.org> Hi,> > I
am having trouble extracting just the year or the month or the > day from
a> date such as 5/7/2007 which is May 7th 2007. Is there any particular>
function to extract just the year from this format?> > When I am reading
this data from a text file it is reading it > correctly in> the same
format but does not acknowlede it as date but as a > factor. If I try>
as.date(5/7/2007) then it is converting it to 1Jan1960. Weird it > is.
Any> help on that front?> > Any help is greatly appreciated.> > 
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______________________________________________> 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.>

______________________________________________________________________________

Marcel Sandow

Leibniz Institute of Marine Sciences - IFM-Geomar
Experimental Ecology: Foodwebs
Düsternbrooker Weg 20
24105 Kiel
Germany

Fon: +49-431-600-4404
Fax: +49-431-600-1515

Homepage: http://www.ifm-geomar.de
E-mail: msandow@ifm-geomar.de



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