R help - Aug 2009 - opration / dates in R

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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i found it it is the function difftime(date1,date2)
thank you gays!!!




________________________________
De : Peter Konings <peter.l.e.konings@gmail.com>

Envoyé le : Jeudi, 6 Août 2009, 11h44mn 09s
Objet : Re: [R] opration / dates in R

Hi,

There are a number of possibilities. Check out the R wiki for an overview of the
available manuals, articles, etc. on working with dates:
http://wiki.r-project.org/rwiki/doku.php?id=guides:times-dates&s=dates

also, consider reading a book or manual to get started - this will save you a
lot of time in the end. See for example the R website for a list of contributed
documentation: http://cran.r-project.org/other-docs.html

HTH
Peter.



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?
>
>
>
>       [[alternative HTML version deleted]]
>
>______________________________________________
>R-help@r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
>


      
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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?
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


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

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