These docs are for an old release.
Info on upgrading to v6
Event::setAllDay
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:
maintainDuration- operates the same way as allDayMaintainDuration