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At the moment, you can't
This is something I've been thinking about recently, for ISP billing things (set the monthly anniversary date, and give total data usage from that date). However it's a bit difficult due to the way that the whole things works. For example, do you do 'start of the month until today' or 'previous calendar month' or what? Not to mention the difficulty of actually calculating the day.
This isnt to say it's impossible, justmore awkward than it would initially seem.
I'll put it in the wishlist for v2.18
_________________ Steve Shipway UNIX Systems, ITSS, University of Auckland, NZ Woe unto them that rise up early in the morning... -- Isaiah 5:11
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