How does Google determine the date a thread was posted?

@bertha 

Google determines the date a thread was posted by looking at the date metadata associated with the web page or content containing the thread. This information is often provided by the website hosting the thread and can be stored in the HTML code of the page or in a database. Google's web crawler, also known as Googlebot, indexes this information and associates it with the thread in its search results, allowing users to see the date the thread was posted.