duration of follow-up

[Annie_Fréchette]

Hi, I'm a new user of SAS and my question may be basic. I want to calculate a duration. I want to substract my first date of sampling from my last date of sampling. And I want to know how many days have passed between these two dates. My dates are numeric values. Here is what I've tried so far....Thanks you very much for your help!!

[PaigeMiller · Accepted solution]

duration = Datemax - Datemin;

gives you the duration in seconds.

To get the number of days, you divide by ... well, you can figure out that, I'm sure.

[Annie_Fréchette]

Thank you!!!

[ed_sas_member]

Hi @Annie_Fréchette 

In addition to @PaigeMiller 's comment, there is no need to use the input() function as your dates are already numeric.

[Annie_Fréchette]

THank's or the info!