How to display the publication date in Google/Yandex?

Question

Google

How to display the publication date of a post in various search engines? Here is an example:

Answer 1

datePublished is responsible for the publication date . If you haven't done microdata markup before, see a brief introduction .

Answer 2

Not only micro-markup affects the display of the date in the search. You also need to set the Last-Modified HTTP header on all pages. More details here: https://last-modified.com/ru/if-modified-since.html .