These docs are for an old release.
Info on upgrading to v5
Event::moveStart
Will move an event’s start date by a specific period of time.
event.moveStart( delta )
delta is a Duration or something that will parse into a Duration.
This method does not modify the event’s end date. If you modify the start, but keep the end the same, you are essentially changing the duration of the event. That’s why this method is analogous to resizing an event from it’s start. If you want to move both the start and the end together, use moveDates.
If there are other events that share the same groupId, those events’ dates will be similarly modified.