How to adjust time by a fixed amount on on a bunch of photos in iPhoto?

[Winston]

Article Accelerator wrote:
Select the photos and go to Batch Change under the Photos menu.

The problem is that you can only select a single date and time for all the photos in the batch. There is an option to add a one-minute increment between photos, but that doesn't set the photos to the actual time taken.

I want to preserve the existing time differentials between photos - not just get the date right. The Batch Change option cannot just add an increment to each photo.

I've got something like 4000 photos from the trip, so changing them individually isn't practical.


- W