INTCK function

[Test_yes]

Hi,

I have 3 dates and I am using INTCK function to find the no. months in between these 3 dates and and '01Feb2020'  as below:

data test;
a='09Mar2017'd;
b='30Dec2018'd;
c='13Jun2016'd;
d='01feb2020'd;
a1= INTCK('MONTH',a,d);
b1= INTCK('MONTH',b,d);
c1= INTCK('MONTH',c,d);
run;

If I count manually as below  I get 36 for the March 9, 2017 date similar to other 2 dates. But the function returns 35. I am not sure why.

December 30, 2018	March 9, 2017	June 13, 2016
January 30, 2019	April 9, 2017	July 14, 2016
March 2, 2019	May 10, 2017	August 14, 2016
April 2, 2019	June 10, 2017	September 14, 2016
May 3, 2019	July 11, 2017	October 15, 2016
June 3, 2019	August 11, 2017	November 15, 2016
July 4, 2019	September 11, 2017	December 16, 2016
August 4, 2019	October 12, 2017	January 16, 2017
September 4, 2019	November 12, 2017	February 16, 2017
October 5, 2019	December 13, 2017	March 19, 2017
November 5, 2019	January 13, 2018	April 19, 2017
December 6, 2019	February 13, 2018	May 20, 2017
January 6, 2020	March 16, 2018	June 20, 2017
February 6, 2020	April 16, 2018	July 21, 2017
	May 17, 2018	August 21, 2017
	June 17, 2018	September 21, 2017
	July 18, 2018	October 22, 2017
	August 18, 2018	November 22, 2017
	September 18, 2018	December 23, 2017
	October 19, 2018	January 23, 2018
	November 19, 2018	February 23, 2018
	December 20, 2018	March 26, 2018
	January 20, 2019	April 26, 2018
	February 20, 2019	May 27, 2018
	March 23, 2019	June 27, 2018
	April 23, 2019	July 28, 2018
	May 24, 2019	August 28, 2018
	June 24, 2019	September 28, 2018
	July 25, 2019	October 29, 2018
	August 25, 2019	November 29, 2018
	September 25, 2019	December 30, 2018
	October 26, 2019	January 30, 2019
	November 26, 2019	March 2, 2019
	December 27, 2019	April 2, 2019
	January 27, 2020	May 3, 2019
	February 27, 2020	June 3, 2019
		July 4, 2019
		August 4, 2019
		September 4, 2019
		October 5, 2019
		November 5, 2019
		December 6, 2019
		January 6, 2020
		February 6, 2020

[bobpep212]

Check out the fourth optional argument,  method: continuous or discrete. Discrete counts the interval boundary.

https://documentation.sas.com/?docsetId=lefunctionsref&docsetTarget=p1md4mx2crzfaqn14va8kt7qvfhr.htm...

[bobpep212]

I think I see what you mean...But it is about the count of movement between months - someone here will correct me. Sorry.

[yabwon]

Hi,
what value would you expect to have between "01feb2020"d and "01jan2020"d ?

Documentation says: "Returns the number of interval boundaries of a given kind that lie between two dates, times, or datetime values."

All the best
Bart

[Tom]

If you want N+1 instead of N why not just add one to the result?

[Rick_SAS]

I don't understand how your "count manually" column is created. Here is how you can see the months between 09Mar2017 and Feb 2020

data test;
a='09Mar2017'd;
d='01feb2020'd;
a1= INTCK('MONTH',a,d);
do i = 0 to a1;
   anniv = intnx('MONTH',a, i, 'same');
   output;
end;
format a d anniv DATE9.;
run;

proc print;run;