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

From: Lauri Nikkinen <lauri.nikkinen_at_iki.fi>
Date: Tue, 18 Mar 2008 13:55:53 +0200

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")

> range(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.


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