[R] Extracting week number starting from a specific date

[irene]

Hello,

I have a list of dates, such as

dates<- as.Date(c("1996-03-29","1996-05-30","1996-09-28","1996-05-09"))

from which I would like to extract the week number for each date, with week
n°1 being the week going from Dec 30th 1995 to Jan 6th 1996 ("1995-30-12" to
"1996-06-01"). Any suggestion for a simple way to do that?

Thank you

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