adding 1 month to a date
On Wed, 12 Oct 2005, Jim Porzak wrote:
OTOH,
> seq(as.Date("2004-01-31"), by = "month", length = 14)
[1] "2004-01-31" "2004-03-02" "2004-03-31" "2004-05-01" "2004-05-31" [6] "2004-07-01" "2004-07-31" "2004-08-31" "2004-10-01" "2004-10-31" [11] "2004-12-01" "2004-12-31" "2005-01-31" "2005-03-03" I would prefer to see dates forced to be within each month, not "leaking" into next month. IOW: [1] "2004-01-31" "2004-02-29" "2004-03-31" "2004-04-30" "2004-05-31", etc
It depends how you intend "1 month after 2004-01-31". Is the the same
number of days before the beginning of the next month or after the end of
the stated month?
seq(as.Date("2004-02-01"), by = "month", length = 14)-1
[1] "2004-01-31" "2004-02-29" "2004-03-31" "2004-04-30" "2004-05-31"
Dave
Dr. David Forrest
drf at vims.edu (804)684-7900w
drf5n at maplepark.com (804)642-0662h
http://maplepark.com/~drf5n/