Date Add: DateFormat(dateAdd('d', 30, '8/3/2014'), 'mm/dd/yyyy') = 09/02/2014
DateDiff: dateDiff("d", "2013-01-15", "2013-01-25") = 10

TodayDate = 2021-02-01
DueDate = 2021-02-06 (TodayDate+5)
DateDiff = 5

มากกว่า 3 วัน