strange date problem - May 3, 1992 is NA

On Jun 22, 2011, at 2:03 PM, Sarah Goslee wrote:

Hi,

On Wed, Jun 22, 2011 at 11:40 AM, Alexander Shenkin <ashenkin at ufl.edu>
wrote:

is.na(strptime("5/2/1992", format="%m/%d/%Y"))

[1] FALSE

is.na(strptime("5/3/1992", format="%m/%d/%Y"))

[1] TRUE

I can't reproduce your problem on R 2.13.0 on linux:

I also cannot reproduce it on a Mac with 2.13.0 beta

Which strongly suggests that you should start by upgrading your R
installation if at all possible.

I'd also recommend trying it on a default R session, with no extra
packages loaded, and no items in your workspace. It's possible that
something else is interfering.

On linux, that's achieved by typing R --vanilla at the command line.
I'm afraid I don't know how to do it for Windows, but should be
similarly straightforward.

Sarah Goslee
http://www.functionaldiversity.org