how to subtract weeks from date

[hjjijkkl]

How do you subtract weeks from a given date? how can i code that

for example I have a data with a date (date1 ) and I want to subtract 36 weeks and get a new date (date2). please look the table below for example.

date1             date 2

5/3/2012       8/25/2011

6/4/2012        9/26/2011

[hjjijkkl]

Meaning subtracting 36 weeks from date1 to get date 2

[Kurt_Bremser · Accepted solution]

Use the INTNX function with a 'week' interval.

[PaigeMiller]

Another way to do this is to suntract 36*7 from each date.

[ballardw]

How many times has it been suggested to you to provide data in the form of a data step?

For one thing, we need to know if the values are actually SAS data values or not.

This shows adjusting a date by 36 weeks to the Same day of the week, Beginning of the week or End of the week.

data have;
   input date1 :mmddyy10.;
datalines;
5/3/2012      
6/4/2012
; 

data want;
   set have;
   date2= intnx('week',date1,-36,'s');
   date3= intnx('week',date1,-36,'b');
   date4= intnx('week',date1,-36,'e');
   format date: mmddyy10.;
run;