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There was a discussion on LIS-UKEIG recently about how to limit a search by date. I posted my response to the list but thought it might be useful for others as well. One of the problems with searching for material in a specific date range is that it's hard for a search engine to know exactly what is required. For example, if you add the date limit 'last 3 months' that doesn't necessarily mean 'new' pages that have been created in the last three months - if a search engine finds a page written 5 years ago that they've only just included in their database that could be included as a 'new' page (depending on engine of course). There used to be a reasonable number of search engines that allowed you to limit by date, but this functionality is become rarer, oddly enough.

