Difference in days between two dates

[Miah]

I am trying to calculate the difference in days between dates. More specifically between the values of variable Date and January 1, 2000. 

Here it is my code and I have attached the data set: 

PROC IMPORT OUT= work.NBA
	DATAFILE= "/folders/myfolders/NBA60.txt"
	DBMS=CSV REPLACE;
	DELIMITER=',';
	GETNAMES=YES;
RUN; 

PROC PRINT DATA=work.NBA;
RUN; 

PROC PRINT DATA = NBA;
	FORMAT Date WORDDATE. ;
RUN;

DATA NBA;
	fecha = intck('day', DATE, "01Jan2000"d); 
RUN;

PROC PRINT DATA=NBA;
RUN;

[Reeza · Accepted solution]

You forgot the SET statement in your data step. 

DATA NBA_DURATION;
        set NBA;
	fecha = intck('day', DATE, "01Jan2000"d); 
RUN;

[Astounding]

Your data has some dates before year 2000, and some after.  So when you calculate the difference, which years should show a negative difference and which a positive difference?

Your formula calculates the number of days as negative for years after 2000.  It's easy to reverse that, and you don't need any functions to do it:

fecha = date - '01jan2000'd;

And yes, you do need a SET statement.