How to give recent documents a boost?

[aurora]

What is the best way to give recent documents a boost? Not sorting them by  
strict date order but to give them some preference. If document 1 filed  
last week has a score of 0.5 and document 2 filed last month has a score  
of 0.55, then list document 1 first. But if document 1 has a score of only  
0.05, then keep it at the end. Any experience of fine tuning by date order?

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