DayPilot Scheduler uses predefined DateTime formats depending on the time unit used in the header:
Row Header Groups
GroupBy="Hour"
-
Hour in format determined by TimeFormat property (12 or 24 hour clock).
Example: "12 AM"
GroupBy="Day"
-
Date formatted using DateTime.ToLongDateString().
Example: "Sunday, January 25, 2039"
GroupBy="Week"
-
Week number according to ISO 8601
GroupBy="Month"
-
Month formatted using DateTime.ToString("MMMM yyyy").
Example: "January 2009"
GroupBy="None"
-
Empty string.