How to find out the date of the last modification of the element (articles, product, news) in Bitrix?

If you need to display the element modification date, then in the template that uses the item must add

<? echo $arResult["TIMESTAMP_X"]; ?>

or

<?=$arResult["TIMESTAMP_X"]?>

Answer 1, Authority 100%

Needs using the ciblockelement :: getByid Get the necessary item by it ID and in the fields of the obtained item get the field timestamp_x it is also stored the date of the last change.