Scanned in a few old pictures recently, and found that some of the tools I had written for organizing and synching them would benefit from (at least approximate) date meta-data.
I found a nice universal tool to modify EXIF data: ExifToool by Phil harvey. It even has a mac installable dmg download.
Here's a nice shortcut for setting all 3 common date fields in a JPEG image.
# show original dates (there are none!) $ exiftool -alldates test.jpg # set the dates $ exiftool "-alldates=1968:05:16 05:00:00" test.jpg # show updated dates (there are 3!) $ exiftool -alldates test.jpg Date/Time Original : 1968:05:16 00:00:00 Create Date : 1968:05:16 00:00:00 Modify Date : 1968:05:16 00:00:00