CCrmActivityCalendar::GetList

public function GetList($arOrder = Array('CREATED_DATE' => 'DESC'), $arFilter = Array(), $arSelect = Array(), $nPageTop = false)
{
        // Fix for #27449
        if (!CModule::IncludeModule('calendar'))
        {
            $obRes = new CDBResult();
            $obRes->InitFromArray(array());
            return $obRes;
        }

	global $USER;
	$ENTITY_ID = 'CALENDAR_EVENT';
	$arElement = $GLOBALS['USER_FIELD_MANAGER']->GetUserFields($ENTITY_ID, 0, LANGUAGE_ID);

	if ($arElement == false || !isset($arElement['UF_CRM_CAL_EVENT']))
	{
		$arFields = array();
		$arFields['ENTITY_ID'] = $ENTITY_ID;
		$arFields['FIELD_NAME'] = 'UF_CRM_CAL_EVENT';
		$arFields['USER_TYPE_ID'] = 'crm';
		$arFields['EDIT_FORM_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['LIST_COLUMN_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['LIST_FILTER_LABEL'][LANGUAGE_ID] = GetMessage('CRM_UF_NAME');
		$arFields['SETTINGS']['LEAD'] = 'Y';
		$arFields['SETTINGS']['CONTACT'] = 'Y';
		$arFields['SETTINGS']['COMPANY'] = 'Y';
		$arFields['SETTINGS']['DEAL'] = 'Y';
		$arFields['MULTIPLE'] = 'Y';
		$CAllUserTypeEntity = new CUserTypeEntity();
		$CAllUserTypeEntity->Add($arFields);
	}

	$entityTypeId = \CCrmOwnerType::ResolveID($arFilter['ENTITY_TYPE'] ?? '');
	if (
		$entityTypeId > 0
		&& isset($arFilter['ENTITY_ID'])
		&& (int)$arFilter['ENTITY_ID'] > 0
	)
	{
		$arFilter['UF_CRM_CAL_EVENT'] = \Bitrix\Crm\UserField\Types\ElementType::getValueByIdentifier(
			new \Bitrix\Crm\ItemIdentifier(
				(int)$arFilter['ENTITY_TYPE'],
				(int)$arFilter['ENTITY_ID']
			)
		);
		unset($arFilter['ENTITY_TYPE'], $arFilter['ENTITY_ID']);
	}
	else if (!empty($arFilter['ENTITY_TYPE']))
	{
		$arFilter['ENTITY_TYPE'] = CUserTypeCrm::GetShortEntityType($arFilter['ENTITY_TYPE']);
		$arFilter['%UF_CRM_CAL_EVENT'] = $arFilter['ENTITY_TYPE'].'_';
		unset($arFilter['ENTITY_TYPE']);
	}
	else
		$arFilter['!=UF_CRM_CAL_EVENT'] = '';

	$arFilter['CAL_TYPE'] = 'user';
	$arFilter['DELETED'] = 'N';
	if (isset($arFilter['OWNER_ID']) && is_array($arFilter['OWNER_ID']))
		$arFilter['OWNER_ID'] = current($arFilter['OWNER_ID']);

	$arCal = CCalendarEvent::GetList(
		array(
				'arFilter' => $arFilter,
				'parseRecursion' => false,
				'userId' => $USER->GetID(),
				'fetchAttendees' => false,
				'fetchMeetings' => true
			)
	);

	$obRes = new CDBResult();
	$obRes->InitFromArray($arCal);
	return $obRes;
}