Hi Vince, I found your post from 7years ago. Your method to convert week number to start date seems very cool, but I tried and SAS gave me error message...do you have any tips to fix the error? it is at the part of the second bracket after z2. Thank YOU! weekstartdate=input(put(yearnum, 4.)||"W"||put(weeknum,z2.))||"01", weekv9.);
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