[R] strptime and "impossible" dates

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From: David Kane a296180@mica.fmr.com)
Date: Wed 25 Jul 2001 - 06:36:46 EST 

Message-id: <15197.56414.625729.368669@gargle.gargle.HOWL>

Typically, when I use strptime with "impossible" dates I get an NA, which is
what I expect.

> version
         _
platform sparc-sun-solaris2.6
arch sparc
os solaris2.6
system sparc, solaris2.6
status
major 1
minor 3.0
year 2001
month 06
day 22
language R
> strptime("20001132", format = "%Y%m%d")
[1] "NA"

But this is not always the case, consider the impossible case of November 31, 2000

> strptime("20001131", format = "%Y%m%d")
[1] "2000-12-01"

Shouldn't the answer here be NA? I would submit this as a bug except that I
suspect that the problem is my misunderstanding of the role of seconds and time
zones is this function . . .

Thanks for any pointers. I have read the help pages and the excellent
discussion in the recent R Newsletter.

Dave Kane
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