## counting months

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Frequent Contributor
Posts: 114

# counting months

I have a range of dates.  I would like to count how many months are within each set of dates along with creating a new variable for each month. For example;

data have;

input start_date end_date;

01/01/2010 12/31/2010

05/01/2010 12/31/2010

05/01/2010 05/14/2010

06/13/2010 08/28/2010;

run;

I would like to create a new variable for each month that contains the counts for each number of months between the start and end dates. For example;

01/01/2010 12/31/2010 --> month1=1 month2=1, month3=1 . . . .month12=1;

05/01/2010 12/31/2010 --> month5=1 month6=1, month7=1 . . . .month12=1;

05/01/2010 05/14/2010 --> month5=1;

06/13/2010 08/28/2010 --> month6=1 month7=1 month8=1;

Based on this sample data, in the end I should have the below counts for each month.

Month1=1

Month2=1

Month3=1

Month4=1

Month5=3

Month6=3

Month7=3

Month8=3

Month9=2

Month10=2

Month11=2

Month12=2

Thank you!

Sophia

Accepted Solutions
Solution
‎04-17-2013 01:39 PM
Super User
Posts: 13,508

## Re: counting months

Are all of your data pairs always within the same calendar year? Are the dates SAS date values or strings?

For your example this seems to work.

data have;

informat start_date end_date mmddyy10.;

format start_date end_date mmddyy10.;

input start_date end_date;

datalines;

01/01/2010 12/31/2010

05/01/2010 12/31/2010

05/01/2010 05/14/2010

06/13/2010 08/28/2010

;

run;

data want;

set have;

array months month1-month12;

do i= month(start_date) to month(end_date);

months=1;

end;

drop i;

run;

All Replies
Solution
‎04-17-2013 01:39 PM
Super User
Posts: 13,508

## Re: counting months

Are all of your data pairs always within the same calendar year? Are the dates SAS date values or strings?

For your example this seems to work.

data have;

informat start_date end_date mmddyy10.;

format start_date end_date mmddyy10.;

input start_date end_date;

datalines;

01/01/2010 12/31/2010

05/01/2010 12/31/2010

05/01/2010 05/14/2010

06/13/2010 08/28/2010

;

run;

data want;

set have;

array months month1-month12;

do i= month(start_date) to month(end_date);

months=1;

end;

drop i;

run;

Frequent Contributor
Posts: 114

## Re: counting months

Thanks!  That worked perfectly.

🔒 This topic is solved and locked.