On Feb 8, 2011, at 10:31 AM, Manuel Gimond wrote:
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?
More likely it has to do with "daylight savings time".
I'm running R x64 2.12.0 on Win7
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