Adjust the photo date and time
You can adjust the date and time a photo was taken at any time. Aperture gives you the option of adjusting the date and time of a photo’s version or the photo’s version and original.
Change the creation date of a photo or group of photos
Select a photo or group of photos.
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Choose Metadata > Adjust Date and Time.
Enter a new date and time in the Adjusted field.
If you want to modify the creation date of the original or originals, select the “Also change original file(s)” checkbox.
Click the Adjust button.
The creation date and time of the version or versions changes. If you selected the “Also change original file” checkbox, the date and time adjustment is applied to the original as well.