Okay, so I've got a whole roll of photos in iPhoto from my girlfriend's camera from spring break. Unfortunately, her camera's internal clock was set wrong. Like, a year and one month wrong. And the time was wrong too. So I've got a whole roll of 123 pictures that have incorrect dates and times. FORTUNATELY, I've got a roll with correct dates and times from another friend who was on break with us, and he took a picture of two of my friends that's almost the same as one my girlfriend took (i.e. they both took a picture almost at the same time). So I've got a photo that gives me a pretty good idea of the "offset" between the incorrect dates/times and the correct ones. My question is: is there a utility out there that will allow me to batch "add" a certain amount of time to the EXIF data for date/time taken in every single photo that's wrong? The photos span a period of one week, so it'd be convenient to just say "add X months, X days, X hours, X minutes" and apply that to every photo, rather than doing everything by hand. Any suggestions?