Why not convert them to dates?
Assuming you are using that perverse Month/Day/Year format
x <- c("12/9/2007" ,"12/16/2007","1/1/2008","1/3/2008","1/12/2008")
xx <- as.Date(x, "%m/%d/%Y")
xx
--- On Tue, 7/21/09, liujb <liujul...@yahoo.com> wrote:
> From: liujb <liujul...@yahoo.com>
> Subject: [R] how to transform m/d/yyyy to yyyymmdd?
> To: r-help@r-project.org
> Received: Tuesday, July 21, 2009, 1:16 PM
>
> Hello,
>
> I have a set of data that has a Date column looks like
> this:
> 12/9/2007
> 12/16/2007
> 1/1/2008
> 1/3/2008
> 1/12/2008
> etc.
>
> I'd like the date to look something like the follow (so
> that I could sort by
> date easily).
> 20071209
> 20071216
> 20080101
> 20080103
> 20080112
>
> How to do it? Thank you very much
> Julia
> --
> View this message in context:
> http://www.nabble.com/how-to-transform-m-d-yyyy-to-yyyymmdd--tp24591898p24591898.html
> Sent from the R help mailing list archive at Nabble.com.
>
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