iPhoto Date / Time Batch change - One photo at a time

Good morning:

I’m running OSX 10.7.1 and iPhoto 9.1.5 with 24,000+ photos. Most of the photos are accurately embedded with the time/date, but thousands have been scanned and imported with “the date” modified to reflect when the original photo was taken (but these dates/times are not embedded in the EXIF data) . I don’t know which are which at this point.

I need something that will advance through the photos from oldest to newest AND that recognizes the existing date / time (embedded or not) of each individual photo and THEN adds 1 second of time to that and then saves (e.g., “Adjust” button) the photo (“Adjust date/time” → Modify original files") so that the embedded EXIF data reflects the adjusted date / time.

Any suggestions are very welcome .

Thank you.

Sincerely,
Bill
tucsonbil@cox.net

Model: MacBook Pro
AppleScript: 2.4
Browser: Safari 534.48.3
Operating System: Mac OS X (10.7)