Alan Pater - 2015-03-24

That would be the exif DateTimeOriginal field or Xmp.photoshop.DateCreated

This is not the same as EXIF DateTimeDigitized (Xmp.xmp.CreateDate) That information can be very different if the image was scanned as opposed to digitally photographed.

Workaround is to use exiftool to set the file date to the "capture" date.

 exiftool '-filemodifydate<createdate' *.jpg