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

[John Kane]

365/7 != 52.  You have more than 52 weeks in each
year.


--- Lauri Nikkinen <lauri.nikkinen at iki.fi> wrote:

> 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.
> 
> Thanks
> Lauri
> 
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