Smart folder "This Quarter"

Hello everyone
I’ve been using DevonThink Pro for the past month, mainly for organising financial documents. I can’t seem to figure this one:

I’d like a smart folder “This quarter” (and also perhaps “Last quarter” and “1st Quarter”). So, today is 1 Mar 2011, and therefore:
“This quarter” means 1 Jan 11 - 31 Mar 11
“Last quarter” means 1 Oct 11 - 31 Dec 11
“1st quarter” means 1 Jan 11 - 31 Mar 11

Any ideas how this is entered into the search to make a smart folder?

Thanks for your help.

This is unfortunately not yet possible but will be in an upcoming release.