The data type used for fields that contain date values. Date values can range from January 1, 4713 B.C.E., to January 1, 9999 C.E. Date values are stored as the number of days from the first date in the range. For example, January 1, 2009, is stored as the number 2454833 because it is 2,454,833 days after the first date in the range. See also date_time data type.