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Update: the question was not clear enough....

I have found a bookmarklet that give me the date of a web page last update:

javascript:alert(document.lastModified)

But it's not very effective because it only works for plain old html.

Is there a clever way to get the date of the last content update (without having tracked it)?

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up vote 1 down vote accepted

As a user, unless the web itself gives you that information you have no way of correctly getting that information from a dynamically generated page. Unless you keep track of that website every X time and compare the current version with the last copy, but that's either getting into coding or using a software to keep track of the site for you.

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You want to know the last time the template was updated? Because the last update of a dynamic page is by definition the last time it was requested.

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I was not clear enough, question updated... – fluxtendu Mar 6 '10 at 4:24
    
Dynamic content comes out of a database, so I'm pretty sure that, barring johnnyArt's suggestion, the answer to your question is no. – goblinbox Mar 7 '10 at 0:03

How about google reader (which tracks changes and makes an rss feed for sites without it) and a rss feed reader?

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You can check browser history. At least in Firefox for sure.

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I could check my last visit in firefox, not when the web page was updated... – fluxtendu Mar 6 '10 at 4:35

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