Date arithmetic fails (PR#1819)

[Thomas Lumley]

On Sun, 21 Jul 2002 RML27@cornell.edu wrote:

> 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"

The problem appears to be with as.POSIXct on the Mac.  Operations that
don't coerce to POSIXct work, those that do, don't.

	-thomas


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