DATESUB - Subtract specified number of days from a date variable

DATESUB Subtract specified number of days from a date variable

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Syntax:	DATESUB	[ variable ] [ amount ]
Arguments:	[ variable ]	A variable that was previously assigned a string value formatted as a date in the style of mm-dd-yy.
	[ amount ]	A variable or a numeric constant representing the number of days to subtract from the date value stored in [ variable ].
Options:	none

This script command is used to calculate a new date by subtracting the specified number of days from the date value stored in the [ variable ] argument. The date string value must be formatted in the same manner as the %date internal variable.

Note: The %date internal variable should not be passed directly in the [ variable ] argument of this command. To use the value of %date with DATESUB you must first assign its value to a user defined variable and then pass that user defined variable to the [ variable ] argument.

Consider the example below where 14 days is subtract from a variable containing the current date.

SET today = %date

DATESUB today 14

DISPLAY today

The number of days to subtract may also be expressed in a variable as shown below.

SET today = %date

SETNUM x = 14

DATESUB today x

DISPLAY today

Dates before January 1st, 1970 ("01-01-70") are not supported.

Related command(s): DATEADD, IFDATE, DATETIMEADD, DATETIMESUB, IFDATETIME