I had many .jpg files that have the incorrect date and time that I would like to fix in a batch. What I mean by this is I'd like to select the photos, indicate the time difference and have all of them adjust to the corrected date/time. I would prefer not to do this in iPhoto. I tried that and it isn't saving the adjustment when I look at the file in the finder window-the adjustment only shows up in iPhoto. I have an "application" called jhead. I've used jhead successfully to fix the "modified" date of my photos (jhead -ft *.JPG), but have had no success getting it to adjust the date and time (jhead -ta-1:15:00 DSCN3221.JPG). Any suggestions or advice would be most welcome and appreciated.