Try this:
seq(as.Date("2005-01-15"), len = 2, by = "month")[2]
or here is another approach:
http://finzi.psych.upenn.edu/R/Rhelp02a/archive/61570.html
On 10/11/05, t c <[EMAIL PROTECTED]> wrote:
>
> Within an R dataset, I have a date field called "date_". (The dates are in
> the format "YYYY-MM-DD", e.g. "1995-12-01".)
>
>
>
> How can I add or subtract "1 month" from this date, to get "1996-01-01" or "
> "1995-11-01".
>
>
>
>
>
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