[R] how to work with Year-Month dates

[Joshua Wiley]

I had started thinking of writing my own class...this is much nicer.  Thanks!

Josh

On Fri, Sep 17, 2010 at 12:27 PM, Henrique Dallazuanna <wwwhsd at gmail.com> wrote:
>
> Try this:
>
> library(zoo)
> as.yearmon(x, "%Y-%B")
>
>
> On Fri, Sep 17, 2010 at 4:23 PM, Joshua Wiley <jwiley.psych at 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/
>>
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>> and provide commented, minimal, self-contained, reproducible code.
>
>
>
> --
> Henrique Dallazuanna
> Curitiba-Paraná-Brasil
> 25° 25' 40" S 49° 16' 22" O
>



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