question about date's

This is one way to do it.

x<-c("2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05")
x

[1] "2005-07-01" "2005-07-02" "2005-07-03" "2005-07-04" "2005-07-05"

substr(x,1,4)

[1] "2005" "2005" "2005" "2005" "2005"

substr(x,6,7)

[1] "07" "07" "07" "07" "07"

substr(x,9,10)

[1] "01" "02" "03" "04" "05"

======= 2005-12-12 20:06:00 ÄúÔÚÀ´ÐÅÖÐÐ´µÀ£º=======

Hi,

Given a frame with calendar date's:

"2005-07-01", "2005-07-02","2005-07-03","2005-07-04","2005-07-05",etc.

I want to extract the following from these dates:

week number
month number
year number

Any ideas how to accomplish this?

Many thanks.

Regards,
Richard

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2005-12-12

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Deparment of Sociology
Fudan University

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