Well it's one of those "features" you would expect to have because Google has had it for so long now. However, Adcenter just got this into their system.

You can now set the date range for every page with campaign data just like Google and Yahoo.

It's almost easy to miss.
You will find it just under your "chose your account" drop down menu. In classic MS fashion it is not fully displayed and obvious you have to click on the expandable box that says "change".

Long time coming, but good job Adcenter.

Discovery