My sister and I were in Italy in 2013. She brought a Nikon Coolpix set to Denver time. I had an iPhone 4s that sets automatically to local time.
I was going through her photos in numerical order for the day we arrived. An oddity that I encountered in the exif data: Date/Time Original increased in each image until 2013:05:03 11:19:59 in IMG_1277.JPG (20:19:59 local time). IMG_1278.JPG & IMG_1279.JPG had already been deleted. IMG_1280.JPG had Date/Time Original of 2013:05:03 04:08:18. I am sure that is not local time and I doubt she ever reset her clock.
What would explain this change?