Date arithmetic fails (PR#1819)

[RML27@cornell.edu]

Full_Name: Ronnen Levinson
Version: 1.5.1
OS: Mac OS 10.1 
Submission from: (NULL) (12.232.201.92)


The value returned by strptime behaves badly after arithmetic operation and/or
combination.

> a=strptime("2002-06-01 12:15:01","%Y-%m-%d %H:%M:%S")
> a
[1] "2002-06-01 12:15:01"
> a+0
[1] "1932-04-25 21:46:45"
> a+3600
[1] "1932-04-25 22:46:45"
b=c(a)
> b
[1] "1932-04-25 21:46:45"

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