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As you can see when you search for "Google Maps", the results are still ranked by relevancy, but you won't find (too many) pages that already existed three months ago.
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Unfortunately Google doesn't offer a way to define other intervals (at least not in the standard interface), but you can use the daterange operator (daterange:startdate-enddate, where startdate and enddate are Julian dates). This form does the conversion between the Gregorian date and the Julian date for you (based on some code from U.S. Naval Observatory):
{ via Matt Cutts }