Can you change creation date?
1 How do you change the creation date for a photo? 2 can you batch change the creation date for a folder of pictures?
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In Photos you can select a photo or several photos at once and then use the command "Image > Adjust Date & Time". If you set the adjusted date and time to a new value, the creation date for the photo will be modified. For all other photos the date and time will be shifted by the same amount. This command is meant to be used, if you forgot to set the clock in the camera correctly and the date and time for all photos need to be adjusted by the same offset.
But to set the date of several photos to the same date and time, you need to use an AppleScript. Photos has no command to set several photos to the same date and time at once.
I am using this script to set the date and time of scanned photos to the same time, with a gap of one minute between successive photos: https://discussions.apple.com/docs/DOC-8421