How to know when a web page was last updated

Question

How can you detect when somebody else s web page was last updated  or was changed

User · Answer

Take a look at archive org  You can find almost everything about the past of a website there

User · Answer

In general  there is no way to know when something on another site has been changed  If the site offers an RSS feed  you should try that  If the site does not offer an RSS feed  or if the RSS feed doesn t include the information you re looking for   then you have to scrape and compare

User · Answer

01  Open the page for which you want to get the information   02  Clear the address bar  where you type the address of the sites    and type or copy paste  from below   javascript alert document lastModified    03  Press Enter or Go button

User · Answer

The last changed time comes with the assumption that the web server provides accurate information   Dynamically generated pages will likely return the time the page was viewed   However  static pages are expected to reflect actual file modification time   This is propagated through the HTTP header Last-Modified   The Javascript trick by AZIRAR is clever and will display this value   Also  in Firefox going to Tools- Page Info will also display in the  Modified  field

[html] How to know when a web page was last updated?

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