topic Re: Determine the week number of a month in SAS Data Management

Determine the week number of a month

Xinhui — Fri, 27 Oct 2017 16:46:39 GMT

Hi guys

I have a variable called "_datadate" that include all Friday from May 2015 to May 2017, I want to output all Friday which is 3rd Friday in the month, I use this code "

DATA AAPL_TEsT1;
set AAPL_test;
week =intck('_datadate',intnx('month',date,0),date)+1;
run; "

But it not work.

I need some suggestions for this issue.

Thank you.

Re: Determine the week number of a month

kiranv_ — Fri, 27 Oct 2017 16:55:09 GMT

you need to calculate for weekday

https://support.sas.com/documentation/cdl/en/lrdict/64316/HTML/default/viewer.htm#a000201173.htm

if week = 3 and weekday = 6

will give your 3rd Friday of everymonth

Re: Determine the week number of a month

Astounding — Fri, 27 Oct 2017 17:02:31 GMT

Here's a different way to calculate WEEK:

week = ceil(day(_datadate)/7);

If you know that your data set contains only Fridays, you could easily follow that with:

if week = 3;

If your data set might contain some non-Fridays, you would have to add a condition:

if week = 3 and weekday(_datadate)=6;

Re: Determine the week number of a month

Xinhui — Fri, 27 Oct 2017 17:10:39 GMT

solve my problem！！！！ thank you very much!!!!!!!

Re: Determine the week number of a month

Reeza — Fri, 27 Oct 2017 17:12:44 GMT

NWKDOM() may be easier to work with.

Returns the date for the nth occurrence of a weekday for the specified month and year.