R help - Sep 2010 - how to work with Year-Month dates

Hi all,

Is there a built in or easier way to work with dates that are *just* Year-Month?
Right now I paste() on a day as a work around, but it ultimately needs to be
in Year-Month form, so then I use format() to get rid of the day.

x <- c("2006-December", "2006-July")
x <- paste(x, "-01", sep='')
x <- as.Date(x, "%Y-%B-%d")
x <- sort(x)
x <- format(x, format = "%Y-%B")
> x
[1] "2006-July"     "2006-December"

Thanks,

Josh


-- 
Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/

Try this:

library(zoo)
as.yearmon(x, "%Y-%B")


On Fri, Sep 17, 2010 at 4:23 PM, Joshua Wiley
<jwiley.psych@gmail.com>wrote:
> Hi all,
>
> Is there a built in or easier way to work with dates that are *just*
> Year-Month?
> Right now I paste() on a day as a work around, but it ultimately needs to
> be
> in Year-Month form, so then I use format() to get rid of the day.
>
> x <- c("2006-December", "2006-July")
> x <- paste(x, "-01", sep='')
> x <- as.Date(x, "%Y-%B-%d")
> x <- sort(x)
> x <- format(x, format = "%Y-%B")
> > x
> [1] "2006-July"     "2006-December"
>
> Thanks,
>
> Josh
>
>
> --
> Joshua Wiley
> Ph.D. Student, Health Psychology
> University of California, Los Angeles
> http://www.joshuawiley.com/
>
> ______________________________________________
> 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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