Because of various excavations of photos from platform to platform to platform (Flickr, OVI, Google Photos, iPhoto) over the years, now that I’ve settled on Apple’s ecosystem to maintain my photos, I’ve ended up with a bunch of photos that have the wrong date.

By “have the wrong date,” I mean, for example, “Photos thinks they’re from May 2020 when, in fact, I took them in March 2013.”

The thing is, the right date is burned into the EXIF data in the photo itself, so I needed a way to say to all the affected photos “change your date to match what’s in the EXIF.”

I wasn’t up to mystically incanting this in AppleScript, but I figured that I could give JavaScript a try, now that JavaScript is an equal scripting partner under macOS.

So here’s a try at a JavaScript that does just that:

var Photos = Application("Photos");
var path = Path("/Users/peter/Desktop/photos");

for (var photo of Photos.selection()) {
	var filename = photo.filename();
	Photos.export([photo], {to: path, usingOriginals: true});
	var tmpfile = Path("/Users/peter/Desktop/photos/" + filename);
	app = Application.currentApplication();
	app.includeStandardAdditions = true;
	var newDate = app.doShellScript("/usr/local/bin/exiftool -T -DateTimeOriginal '" + tmpfile + "'");
	if (newDate != '-') {
		var d = new Date(newDate);
		photo.date = d;
	}
}

With that script in Script Editor, I can select one or more photos in Photos, run the script, and have those photos with an EXIF date get their date updated.

You’ll notice that there’s a kludgey export of the original photo to a working directory; that serves two purposes:

1. I couldn’t for the life of me figure out how to identify the original path for a photo in Photos, so as to run exiftool against it; this saves me the trouble.
2. I end up with a working directory filled with the original photos should something go horribly wrong with the script.

To get this to work you’ll need to install exiftool, and adjust the path to it in the script as necessary.

Your mileage with the script may vary, but it worked for my purposes, and that glut of May 2020 photos are now safely back in March 2013.