Date Functions - Tableau
help.tableau.com › current › proDATEDIFF. DATEDIFF(date_part, date1, date2, [start_of_week]) Returns the difference between date1 and date2 expressed in units of date_part. The start_of_week parameter, which you can use to specify which day is to be considered the first day or the week, is optional. Possible values are 'monday', 'tuesday', etc.