[R] strptime and "impossible" dates

David Kane <David Kane a296180 at mica.fmr.com
Tue Jul 24 22:36:46 CEST 2001

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   
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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