gistfile1.txt

//each $event is an SS ArrayDatas
foreach($events as $event) {
  $startDateTime = strtotime($event->startDateTime);
  $startDate = date('D, m/d', $startDateTime);
  $event->startTime = $startTime = date('h:i A', $startDateTime);
  $event->endTime = $endTime = date('h:i A', strtotime($event->endDateTime));

  if(!array_key_exists($startDate, $EventsByDate)) {
    $EventsByDate[$startDate] = new ArrayData(array("StartDate" => $startDate,
						    "EventsByTime" => new ArrayList()));
  }
  $times = $EventsByDate[$startDate]->EventsByTime->column('StartTime');
  if(!in_array($startTime, $times)){
    $EventsByDate[$startDate]->EventsByTime->push(new ArrayData(array("StartTime" => $startTime,
								      "EndTime" => $endTime,
								      "Events" => new ArrayList())));
  }
  $eventsByTime = $EventsByDate[$startDate]->EventsByTime->filter('StartTime', $startTime)->first();
  $eventsByTime->Events->push($event);
}
$EventsByDateList = new ArrayList($EventsByDate);
return $this->Customise(array('EventsByDate' => $EventsByDateList));