Applications :: How To Change Date Stamp On Photos

My girlfriend and I have been sharing her Kodak camera for a while now. We use it to take family photos and such. I then use iPhoto to import the photos and break them up into events. Well, I let my girlfriend use the camera about 3 months ago and she changed the time stamp of the photos to 2008 instead of 2009 somehow. I sat down about a week ago to import all the photos we had since taken and was shocked when iPhoto put the new events way back with events from 2008. I then realized the time stamp was off and about had a fit. I quickly rectified the problem on the camera so this will no longer be an issue, but we have tons of great photos which are all incorrectly dated.

And call me a perfectionist, but its driving me nuts!! Now whenever I'm showing friends and family photos I have to scroll way back to 2008, and its just not fluid. I have tried quite a few things to change the date stamp. I cant seem to find any options in iPhoto, so I went into finder and opened the "Get Info" pain to see if I could manually change it, but no dice. I've googled for a week now and cant seem to find an answer. Does anyone know of some software that can handle this or a trick im overlooking? (Just to clarify, by date stamp, im not referring to the date image ingrained on the picture itself, but rather the date the camera assigns to the image file.)