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How to get week of the year, scale 1-52?

Lauri Nikkinen 
R users,

I have a vector of dates

days <- seq(as.Date("2007/1/1"), as.Date("2008/1/31"), "days")

and I would like to have week numbers from 1 to 52 for each year. How
do I do that? Now I get 00-53 using

format(days, "%W")
[1] "00" "53"

I have read "Date and Time Classes in R" (R news 01/04 by Gabor
Grothendieck and Thomas Petzoldt) with no help.

Thanks
Lauri

Thread (8 messages)

Lauri Nikkinen How to get week of the year, scale 1-52? Mar 18 Gabor Grothendieck How to get week of the year, scale 1-52? Mar 18 Liaw, Andy How to get week of the year, scale 1-52? Mar 18 John Kane How to get week of the year, scale 1-52? Mar 18 Lauri Nikkinen How to get week of the year, scale 1-52? Mar 18 John Kane How to get week of the year, scale 1-52? Mar 18 Eik Vettorazzi How to get week of the year, scale 1-52? Mar 18 Peter Dalgaard How to get week of the year, scale 1-52? Mar 22