Grouping date variable into weeks

[Krysia24]

I have a date variable and I want to be able to calculate its corresponding week start date. Example:

Have:

Date

1/5/2020

1/6/2020

1/7/2020

1/12/2020

1/21/2020

1/23/2020

Want:

Date:              Week Start Date: 

1/5/2020         1/5/2020

1/6/2020         1/5/2020

1/7/2020         1/5/2020

1/13/2020       1/12/2020

1/21/2020       1/19/2020

1/23/2020        1/19/2020

[novinosrin · Accepted solution]

data have;
input date :mmddyy10.;
format date mmddyy10.;
cards;
1/5/2020

1/6/2020

1/7/2020

1/12/2020

1/21/2020

1/23/2020
;

data Want;
 set have;
 Week_start=intnx('Week',date,0,'b');
 format Week_start mmddyy10.;
run;

[Barkat]

Here the week_start starts on Sunday. How can I modify the code, so the week_start starts on Saturday?

[Barkat]

I found that.

data Want;
set have;
Week_start=intnx('Week.7',date,0,'b');
format Week_start mmddyy10.;
run;