[R] Year and Month extraction from Date object.

Prof Brian Ripley ripley at stats.ox.ac.uk
Tue Oct 27 22:56:16 CET 2009

?weekdays contains


      Other components such as the day of the month or the year are very
      easy to compute: just use ‘as.POSIXlt’ and extract the relevant

(d <- Sys.Date())
1900 + as.POSIXlt(d)$year
1 + as.POSIXlt(d)$mon

should get you started.

On Tue, 27 Oct 2009, rkevinburton at charter.net wrote:

> Hello,
> I have seen much discussion on Date. But I can't seem to do this 
> simple operation. I can convert a string to a date:
> d <- as.Date(DATE, format="%m/%d/%Y")
> But what I want to do is extract the year and month so I can 
> construct an element in a ts object. Ideally I would like to see 
> d$year but that doesn't seem to be available. Once I have a Date 
> object how can I get an integer year?
> Thank you.
> Kevin

Brian D. Ripley,                  ripley at 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

More information about the R-help mailing list