[R] Date conversion

[Sundar Dorai-Raj]

Hi,

There are possibly several ways to do this. My approach would be:

dates <- strptime(as.character(DATE), "%d%b%Y")
year <- dates$year + 1900
week <- floor(dates$yday/365 * 52)

HTH,

--sundar

On Thu, Mar 5, 2009 at 8:58 AM, Pele <drdionc at yahoo.com> wrote:
>
> Hi R users,
>
> I have a factor variable called date as shown below:  Can anyone share the
> best / most efficient way to extract year and week (e.g.  year = 2006, week
> = 52 for first record, etc..)?  My data set has 1 million records.
>
> DATE
> 11DEC2006
> 11SEP2006
> 01APR2007
> 02DEC2007
>
>
> Thanks in advance for any help!
> --
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