I know it is not very useful to you, but on Vista with 2.11.patched it works:
> strptime("5/20/2010 6:45:32 PM", "%m/%d/%Y %I:%M:%S %p")
[1] "2010-05-20 18:45:32"
> strptime("5/20/2010 6:45:32", "%m/%d/%Y %I:%M:%S")
[1] "2010-05-20 06:45:32"
>
> sessionInfo()
R version 2.11.0 Patched (2010-04-26 r51822)
i386-pc-mingw32

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base
>
Maybe you can try to set the LANGUAGE to English.
Good luck!
                mario

On 24-May-10 2:59, Samuel Dennis wrote:
I am attempting to import dates in the following format to R:
5/20/2010 6:45:32 PM

Unfortunately I am unable to get the AM/PM function (%p) to work correctly
under either 2.11.0 or 2.8.1.
strptime("5/20/2010 6:45:32 PM", "%m/%d/%Y %I:%M:%S %p")
[1] NA

but
strptime("5/20/2010 6:45:32", "%m/%d/%Y %I:%M:%S")
[1] "2010-05-20 06:45:32"

showing that the problem is with %p.

I could only find one previous mention of this issue in the archives (
http://tolstoy.newcastle.edu.au/R/e2/help/06/11/6272.html) , which provided
no solution beyond upgrading R (which I have done), and just suggested it
was a problem with that particular installation of R and Windows.

What could I do to get this function working on my Windows XP machine?

Thankyou,

Samuel Dennis
sjdenn...@gmail.com

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