Converting date strings that range between Mar-14-2010 2:00 and 
Mar-14-2010 2:59 (inclusive) to date objects (POSIX) returns a NA entity:

 > strptime("3/14/2010 2:00",format="%m/%d/%Y %H:%M")
[1] "2010-03-14 02:00:00"

This looks fine, however other functions such as plot see a NA object 
instead:

 > is.na(strptime("3/14/2010 2:00",format="%m/%d/%Y %H:%M"))
[1] TRUE

I've processed an entire range of dates for 2010 and have only come 
across this problem for the aforementioned date ranges. For instance, 
the following dates work fine:

 > is.na(strptime("3/14/2010 3:00",format="%m/%d/%Y %H:%M"))
[1] FALSE

 > is.na(strptime("10/14/2010 23:00",format="%m/%d/%Y %H:%M"))
[1] FALSE

which is what I would expect for ALL dates.

Could this be a bug with POSIX or strptime? I'm running R x64 2.12.0 on Win7









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