How to create working day from the event?

[bd_user_10]

Hi Everyone,

I have the following dataset:

Date	Sedol	event_day	Calday
31/01/1995	4553275	9/02/1995	-9
1/02/1995	4553275	9/02/1995	-8
2/02/1995	4553275	9/02/1995	-7
3/02/1995	4553275	9/02/1995	-6
6/02/1995	4553275	9/02/1995	-3
7/02/1995	4553275	9/02/1995	-2
8/02/1995	4553275	9/02/1995	-1
9/02/1995	4553275	9/02/1995	0
10/02/1995	4553275	9/02/1995	1
13/02/1995	4553275	9/02/1995	4
14/02/1995	4553275	9/02/1995	5
15/02/1995	4553275	9/02/1995	6
16/02/1995	4553275	9/02/1995	7
17/02/1995	4553275	9/02/1995	8
20/02/1995	4553275	9/02/1995	11

I would like to create a column of working day from the event. 

Date	Sedol	event_day	Calday	workday
31/01/1995	4553275	9/02/1995	-9	-7
1/02/1995	4553275	9/02/1995	-8	-6
2/02/1995	4553275	9/02/1995	-7	-5
3/02/1995	4553275	9/02/1995	-6	-4
6/02/1995	4553275	9/02/1995	-3	-3
7/02/1995	4553275	9/02/1995	-2	-2
8/02/1995	4553275	9/02/1995	-1	-1
9/02/1995	4553275	9/02/1995	0	0
10/02/1995	4553275	9/02/1995	1	1
13/02/1995	4553275	9/02/1995	4	2
14/02/1995	4553275	9/02/1995	5	3
15/02/1995	4553275	9/02/1995	6	4
16/02/1995	4553275	9/02/1995	7	5
17/02/1995	4553275	9/02/1995	8	6
20/02/1995	4553275	9/02/1995	11	7

How to do that? Can someone please help? Thanks in advance for your help.

[mkeintz]

SAS has two excellent functions for dates, times, and datetimes.  INTNX, which you don't need here produces a date from a starting date and an interval size, where the interval could be day, week, month, qtr, hour, etc.

You want INTCK, which gets the interval size between two dates.  In your case the interval is not DAY or MONTH, etc.  It is "weekday" (which I presume is what you mean by "work day"):

data have;
  input  Date ddmmyy10.   Sedol event_day ddmmyy10. Calday;
  format date event_day date9.;
datalines;
31/01/1995 4553275  9/02/1995 -9
 1/02/1995 4553275  9/02/1995 -8
 2/02/1995 4553275  9/02/1995 -7
 3/02/1995 4553275  9/02/1995 -6
 6/02/1995 4553275  9/02/1995 -3
 7/02/1995 4553275  9/02/1995 -2
 8/02/1995 4553275  9/02/1995 -1
 9/02/1995 4553275  9/02/1995  0
10/02/1995 4553275  9/02/1995  1
13/02/1995 4553275  9/02/1995  4
14/02/1995 4553275  9/02/1995  5
15/02/1995 4553275  9/02/1995  6
16/02/1995 4553275  9/02/1995  7
17/02/1995 4553275  9/02/1995  8
20/02/1995 4553275  9/02/1995 11
run;

data want;
  set have;
  wrkday=intck('weekday',event_day,date);
run;

Question:  what do you intend to do about holidays that fall on weekdays?

[PGStats]

If workday is the same as weekday :

workday = intck("weekday", event_day, date);