Hi Linden McNeilly,
In case if you have lost your photos from your iPhoto library. You can recover them back with the help of a photo recovery software. The one which I use is Yodot Mac Photo recovery software to recover iPhoto photos. So if you have any photo loss from your iPhoto library you can use this software.
Firts set the time and date
Go to "Setup" menu
Highlight "Date"
Display DATE menu
change yera. miont, day , hour
left menu
Time and date of recording is included with all pictures
taken with your Nikon digital camera.
try again , take a picture and look if show date time
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