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Date Arithmetic

Date arithmetic allows the calculation of the number of days between two dates and provides the ability to add a number of days to, or subtract a number of days from, a date.

Note:  In all examples below, any combination of date and airdate type can be used for date1 and date2 (e.g., newdate = date - airdate is a valid statement).

Example 1

newdate = date1 - date2

This statement gives the difference between date1 and date2 in days as the variable newdate.  The date variables can be in either order; [date1 - date2] and [date2 - date1] both yield the same positive number.

Example 2

date1 = date2 + nbr_of_days

This statement adds a number of days to date2, then assigns that new date to date1.

Example 3

date1 = date2 - nbr_of_days

This statement subtracts a number of days from date2, then assigns that new date to date1.