new date variables

[sophia_SAS]

Dear SAS Community,

I have a list of "Old_dates" of which I would like to create a new variable "New_dates" that groups the "Old_dates by week according to the last Saturday in that week.  See my example below.  As I have many years worth of dates, how do I automate the process?  I'd like to avoid manual coding for the new variable (i.e. if '02Mar2013' < old_date <=09Mar2013 then new_dates = '09Mar2013').

Note, old_dates may not always have all 7 days in a week listed.  Sometimes only 3-4 dates are listed per each 7 day time frame and one may or may not be a Saturday (see "New-dates=09Mar2013).

Thank you in advance!

Sophia

Old_dates     New_dates

24Feb2013 = 02Mar2013

25Feb2013 = 02Mar2013

26Feb2013 = 02Mar2013

27Feb2013 = 02Mar2013

28Feb2013 = 02Mar2013

01Mar2013 = 02Mar2013

02Mar2013 = 02Mar2013

05Mar2013 = 09Mar2013

06Mar2013 = 09Mar2013

07Mar2013 = 09Mar2013

08Mar2013 = 09Mar2013

11Mar2013 = 16Mar2013

12Mar2013 = 16Mar2013

13Mar2013 = 16Mar2013

16Mar2013 = 16Mar2013

[Keith · Accepted solution]

new_dates=intnx('week',old_dates,0,'end');