count exactly no of days between two days

[BrahmanandaRao]

Hi Guys

 suppose a person visit respective dates I want to count no of days between two dates

 required answer is 2 days as per below dates 

data count;
st_date ='01JAN2021'd;
end_date='02JAN2021'd;
fromat st_date end_date date9.;
count_total=intck('day',st_date,end_date);
put count_total= ;
run;

[Kurt_Bremser]

If you need to include both the start and end day, add 1 to the result.

INTCK counts the number of interval boundaries between the values.

[BrahmanandaRao]

suppose three days then 

data count;
1st_date ='01JAN2021'd;
2nd__date='02JAN2021'd;
3rd_date='05APR2021'd;
fromat 1st_date 2nd_date 3rd_date date9.;
count_total=intck('day',st_date,end_date)+1;
put count_total= ;
run;

[Kurt_Bremser]

Apart from the obvious syntax error in the FORMAT statement, this code will only create missing values.

I STRONGLY suggest you run your code in your SAS environment and see what it does (Maxim 4).