How can I explore my base in general, not only hands I played?

[Sempronius]

Hi. I've got big base - 10+ million hands (I bought hand histories).
Is there any way I can see, how many hand histories I have for particular time period?

I know how to see, let's say, all hands with particular player, played in March 2012, but I want to know how much hand histories I have total for March 2012.

[Patvs]

If there is no hero, it's not possible to see how many non-hero hands are in a specific month.