HOW TO find approximate time when a web page was posted

For certain time-sensitive info on the Web to be useful, it helps to know when a particular web page was posted.

Google now extracts and shows the byline date from pages that have one. The byline dates are presented uniformly even though they may be in different formats.

Search Google by providing the URL of the web page whose posting date you want to find. If this does not help, try the Internet Archive Wayback Machine.