CCalendar::ClearSyncInfo

static function ClearSyncInfo($userId, $syncType)
{
	$syncTypes = array('iphone', 'android', 'mac', 'exchange', 'outlook', 'office365', 'icloud');
	if (in_array($syncType, $syncTypes))
	{
		CUserOptions::DeleteOption("calendar", "last_sync_".$syncType, false, $userId);
	}
}