The difference between '01/10/2006 4:39:11 PM' AND
        '02/10/2006 4:39:11 PM' is smaller than 72 hours.
The difference between '01/10/2006 4:39:11 PM' AND
        '04/10/2006 4:39:11 PM' is equal to 72 hours.
The difference between '01/10/2006 4:39:11 PM' AND
        '06/10/2006 4:39:11 PM' is bigger than 72 hours.