$elements = CIBlockElement::GetList(
array(),
array("ACTIVE_DATE" => "Y")
)->fetch();
$elements = \Bitrix\Iblock\ElementTable::getList(array(
"filter" => array("ACTIVE_DATE" => "Y")
))->fetch();
$elements = \Bitrix\Iblock\ElementTable::getList(array(
"filter" => array(">=ACTIVE_FROM" => "ТЕКУЩЕЕ_ВРЕМЯ", "<=ACTIVE_TO" => "ТЕКУЩЕЕ_ВРЕМЯ")
))->fetch();