Try this:
as.Date("18/08/2008", "%d/%m/%Y")  - as.Date("18/09/2010", "%d/%m/%Y")

On Thu, Aug 6, 2009 at 6:27 AM, Inchallah Yarab <inchallahyarab@yahoo.fr>wrote:

> Hi,
>
> how can i use operation + , - , / with veriable format DATES?
>
> for example i have two variable a <- 18/08/2008 and b <- 18/09/2010 and i
> want to calculate a-b ??
>
> thank you?
>
>
>
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>
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>



-- 
Henrique Dallazuanna
Curitiba-Paraná-Brasil
25° 25' 40" S 49° 16' 22" O

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