07-10-2017 09:20 PM
As part of a large data set, 2 of my columns contain dates that I want to subtract to get the difference in number of days
For example (imagine 1000+ rows):
Person Column B Date_Start Date_End Column E
A 1/1/17 1/9/17
B 3/3/17 3/6/17
C 2/7/17 2/12/17
D 8/8/17 8/8/17
E 9/1/17 9/30/17
How do I subtract Date_End from Date_Start columns to get:
I've tried proc sql where I've assigned the following, but this doesn't seem right:
min(Date_Start) as Date_Start, max(Date_End) as Date_End, max(Date_End) - min(Date_Start) as Date_Difference,
Also had a go with (preferred code layout):
data timing; set timing; by Person; Date_Difference = intck('Date_Difference', Date_Start, Date_End); put Date_Difference = ; run;
Any help with the coding would be appreciated!
07-10-2017 10:12 PM
Dates can be subtracted directly to get the number of days, either in SQL or the data step. If you're going to use INTCK, the interval, which is the first parameter is 'DAY'
07-10-2017 10:15 PM
If your dates are actually character strings rather than true SAS dates, you would need:
date_difference = input(Date_End, mmddyy8.) - input(Date_Begin, mmddyy8.);
Need further help from the community? Please ask a new question.