Date arithmetic fails (PR#1819)

[Stefano Iacus]

I have partially fixed this bug. Now arithmetic works fine but I still 
have problems with TZ, i.e.

 > 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] "2002-06-01 05:15:01"
 > a+3600
[1] "2002-06-01 06:15:01"
 > b=c(a)
 > b
[1] "2002-06-01 05:15:01"

TZ is set to +0100 dy default on the Carbon R.

stefano

On Domenica, luglio 21, 2002, at 08:26 , 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"
>
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