start() start(newStart)
The new value is applied when you call dp.events.update(e) [e.g. DayPilot.Scheduler.events.update()].
If called without a parameter, it returns an event start (DayPilot.Date).
var oldStart = e.start();
e.start(new DayPilot.Date('2015-10-01T00:00:00'));