The eventResizingStartEndFormat property (string) specifies the date/time format to be used by the target position indicators. The indicators can be enabled using eventResizingStartEndEnabled property.
The string uses the format described in the DayPilot.Date.toString() method documentation.
"MMMM d, yyyy"
dp.eventResizingStartEndFormat = "h:mm tt";
Event calendar/scheduling AJAX components. Available for JavaScript/HTML5/jQuery, ASP.NET, ASP.NET MVC. Build resource booking, project management, time tracking applications, personal and shared event calendars.