[R] Date conversion

[Uwe Ligges]

Pele 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


Since I am not in the correct locale:

Sys.setlocale(locale="C")
date <- strptime(DATE, "%d%B%Y")
format(date, "%Y")
format(date, "%W") # which is certainly not 52

Uwe Ligges




> 
> Thanks in advance for any help!