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.

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