Dates (years) messed up on import, simply fix?

Dates (years) messed up on import, simply fix?

When we imported our accounts, we didn't notice that the dates on most of our accounts and events were botched somehow. For example, 2009 became 0009. Because there's no way to automatically import attachments, we just spent several hours transferring them by hand, so starting over here kind of isn't an option.

Is there some simple way to go through and automatically change any year starting with 00 to 20? That would completely resolve our issue, which is causing problems for our reports.