[gentoo-user] [way OT] determining date of web pages

I should probably know this having been an active computer user for a
decade or more but ...never really looked into it.

How can I tell ahead of time or quickly what the vintage of a webpage
that looks interesting is?

I often find when looking for some kind of consumer good like a DVR or
something that the hot item I'm reading about was posted in 2004 after
having spent a 1/2 hr reading to that point.

Or worse yet... never really see any indication of when something was
written.

Here is an example page:
 http://dvr.about.com/od/capturetvwithacomputer/ht/htnti.htm

How can I tell quickly when this was written?

A related point is how accurate is it to use the google advanced
search and specify `last 3 mnths' or the like?

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