Defining facets on a date range

I want to define a facet on a date rang开发者_StackOverflow社区e.Is this possible?

For example I have many requests and I want to have a facet displaying something like this:

Requests today(2) Requests this week(10) Requests this month(245)

where 2,10 and 245 are the number of requests raised on this day,this week and this month respectively.

Thanks in advance.

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Please refer to:
http://groups.google.com/group/thinking-sphinx/browse_thread/thread/e7a8f18f8e064d5c