Convert Character to Date

If you want the vector to be a Date you need to specify a date at least down to the day.  Otherwise the date is not well defined and becomes <NA> as you noted.

Perhaps the easiest thing is to give it a particular day of the month, e.g. the first, or the 15 (the "ides"), or ...

x <- as.Date(paste("1990-January", 1, sep="-"), format = "%Y-%B-%d")
x

[1] 1990-01-01

Now if you want to display the date suppressing the dummy day, you can

y <- format(x, "%Y-%B")
y

[1] "1990-January"


Bill Venables
http://www.cmis.csiro.au/bill.venables/ 


-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Bob Roberts
Sent: Tuesday, 31 March 2009 5:14 PM
To: r-help at r-project.org
Subject: [R] Convert Character to Date

Hello,
   I have a date in the format Year-Month Name (e.g. 1990-January) and R classes it as a character. I want to convert this character into a date format, but when I try as.Date(1990-January, "%Y-%B"), I get back NA. The function strptime also gives me NA back. Thanks.



      

______________________________________________
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.