[R] extract day or month as in Splus

Karl Ove Hufthammer karl at huftis.org
Tue Oct 27 09:13:30 CET 2009

On Fri, 23 Oct 2009 12:06:28 -0600 Fang (Betty) Yang 
<fang.yang at ualberta.ca> wrote:
> dates <- c("02/27/1992", "02/27/1992", "01/14/1992", "02/28/1992",
> "02/01/1992")
> Could anyone give me some R codes to get the same results as above'
> (extract days from dates), please?

If your dates are real dates, and not just character strings, the 
simplest way is to use the 'weekdays' functions. For you data:

# Convert the character strings to dates
dates=as.Date(dates, format="%m/%d/%Y")

# Extract the day names (note that these are localised day names)

See the help file for 'weekdays' for details.

Karl Ove Hufthammer

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