On Jul 7, 2010, at 7:40 AM, Christofer Bogaso wrote:
> Dear all, I have a date related question. Suppose I have a character string
> "March-2009", how I can convert it to a valid date object like
> as.yearmon("2009-01-03") in the zoo package? Is there any possibility there?
>
> Ans secondly is there any R function which will give the names of of all
> months as "LETTERS" does?
>
> Thanks for your time.
You may need to append a default day, so something like:
> as.Date(paste("March-2009", "-15", sep = ""), format = "%B-%Y-%d")
[1] "2009-03-15"
Otherwise on OSX, I get:
> as.Date("March-2009", format = "%B-%Y")
[1] NA
The above behavior regarding missing components is system specific, as per the
Note in ?as.Date. Also see ?strptime for the formatting options.
For the second part:
> month.name
[1] "January" "February" "March" "April" "May"
[6] "June" "July" "August" "September" "October"
[11] "November" "December"
See ?LETTERS
HTH,
Marc Schwartz
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