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

[Winston]

I tried it by duplicating three photos and putting the correct date and time in for the first one, and not checking the "add one minute between photos" box. All three photos got the exact same date and time.

Not what I want.

Note that this is iPhotos, not Photos.

Edit: It looks like Photos allows you to do what I want, but I don't see a way to do it in iPhoto.


- W