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Macro Loops by Month

Here's a macro which executes some code for each month in an interval. Months are assumed to be specified in the format YYYYMM.

%macro monthly(first,last); 
  %do mon=&first %to &last;
    %if %substr(&mon,5)=13 %then 
      %let mon=%eval(%substr(&mon,1,4)+1)01;
    %put Processing month &mon; 
%mend monthly; 

Invoking the macro thus:

%monthly(200311, 200402); 

yields the following output;

Processing month 200311 
Processing month 200312 
Processing month 200401