Okay for all you trivia buffs out there

There was a day where all 4 chicago teams - Cubs, Sox, Bulls and Hawks
- won on the same day. I know something like this is akin to all the
planets lining up; only going to happen once every quarter century or
so. But I know it did happen! This was about 7 - 10 years ago.

Can anyone come up with the date and maybe a web source to confirm it?
Thanks!