DIFF_QUARTER( ) Calculates the number of quarters between two date values. Syntax DIFF_QUARTER(date1, date2) Arguments date1 The first date or date expression to use in the calculation. date2 The second date or date expression to use in the calculation. Returns The number of quarters between date1 and date2. DIFF_QUARTER calculates the difference by subtracting the month number of date1 from the month number of date2. A difference of three months is equal to one quarter. For example, if date1 is 8/1/08 and date2 is 10/31/08, DIFF_QUARTER( ) returns 0. If date1 is 8/25/08 and date2 is 11/5/08, DIFF_QUARTER( ) returns 1. Example The following example calculates the number of quarters between each value in the PlanClosing data field and each value in the ActualClosing data field: DIFF_QUARTER([PlanClosing],[ActualClosing]) The following example calculates the number of quarters from each value in the orderDate data field to the end of the year: DIFF_QUARTER([orderDate], "1/1/09")