11-09-2017 09:00 PM
11-09-2017 09:24 PM
Global macro variables work throughout a session. If you declare it once, you don't need to keep redeclaring it.
It helps to have it at the top of the program because it allows you to manually test things, but it's not necessary.
%let dd = %sysfunc(day(%sysfunc(today())), z2.); %put DD = ⅆ
11-10-2017 03:05 AM
@Reeza inserted the %put just so you can see in the log which value was derived from the initial %let, and that it works as expected. That way values are also kept in the log for future reference. Aside from showing values in the log, the %put does nothing.