The day type is an indicator that a certain calendar day is payment- relevant, that is, an employee is paid for working that day. An employee's scheduled attendance can differ from the employee's daily work schedule.
Example:
Two day types are defined in the standard R/3 System. Day type "0" or "blank" indicates a paid workday and day type "1" indicates days that are paid but no work is performed. Therefore, public holidays are assigned the day type "1."
If a calendar day is assigned the day type "1," than the day is considered "off" and is paid, although the employee usually works on that day according to his or her daily work schedule. This is the case, for example, when a public holiday falls on a Thursday.