Calculates and returns the number of days until a specific anniversary, based on the date supplied in the first argument.
ANNIVERSARY_DAYSTO(<date_field or date> [, <anniversary number>] )
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date_field or date: The date field to use in the calculation.
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anniversary number: The number of years to add to calculate the anniversary. Leaving this as null will default to the first anniversary.
Example: Create a field on the PURCHASE table that calculates how many days until the First Anniversary of that Purchase date.
ANNIVERSARY_DAYSTO( [PURCHASE.PURCHASE DATE] , 1 )