Dear R-people! I am using R 1.8.0, under Windows XP. While using ISOdate() and strptime(), I noticed the following behaviour when "wrong" arguments (e.g., months>12) are given to these functions:
> ISOdate(year=2003,month=2,day=20) #ok [1] "2003-02-20 13:00:00 Westeuropäische Normalzeit" > ISOdate(year=2003,month=2,day=30) #wrong day, but returns a value [1] "2003-03-02 13:00:00 Westeuropäische Normalzeit" > ISOdate(year=2003,month=2,day=35) #wrong day, and returns NA [1] NA > ISOdate(year=2003,month=2,day=40) #wrong day, but returns a value [1] "2003-02-04 01:12:00 Westeuropäische Normalzeit" > ISOdate(year=2003,month=22,day=20) #wrong month, but returns a value [1] "2003-02-02 21:12:00 Westeuropäische Normalzeit" And almost the same with strptime(): > strptime("2003-02-20", format="%Y-%m-%d") [1] "2003-02-20" > strptime("2003-02-30", format="%Y-%m-%d") [1] "2003-03-02" > strptime("2003-02-35", format="%Y-%m-%d") [1] NA > strptime("2003-02-40", format="%Y-%m-%d") [1] "2003-02-04" > strptime("2003-22-20", format="%Y-%m-%d") [1] NA Is this considered to be a user error ("If you put garbage in, expect to get garbage out"), or would it be safer to generally return Nas, as in ISOdate(year=2003,month=2,day=35)? -Heinrich. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help