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Sets whether an event is considered all-day.

event.setAllDay( bool, [ settings ] )

bool must be true or false.

If converting to allDay:false, if the event’s start and end dates will have their times set to 00:00:00.

If there are other events that share the same groupId, those events’ dates will be similarly modified.

The settings object is an optional parameter that can contain a single flag: