If you search at Yahoo for the phrase “world cup” (without the quotation marks), chances are good that the search engine will show you mostly pages about the 2010 World Cup, even though the tournament is held every 4 years and there may be many pages relevant for the phrase that don’t focus specifically upon a particular year.
How likely is it that when someone searches for “world cup,” they are looking for information about the upcoming tournament, taking place in South Africa between June 11th, and July 11th, 2010? On the other hand, how likely might it be that they want to find information about the world cup held in 2006? Or just general pages about the sporting event?
If I told you that the search engine was likely reordering those search results based upon time-based data, would it surprise you? Would you expect a Yahoo or Google or Bing to focus upon rerank search results in a manner like this, when they have some temporal aspect to them, such as a search for the Olympics, or the World Series, or the World Cup?
It’s quite possible that a search engine would look through its query logs, and see if a particular query is often included in more specific searches that include some kind of temporal data such as a year, or month, or day or time of day, and rewrite a searcher’s query to include that time-based information. A recent Yahoo patent application explains one fairly simple approach towards showing such information. The patent application is: