Google Photo: Chronological Sequence of Images from Mixed Sources
On the road, I usually take pictures with an iPhone and a Nikon DSLR with a GPS -module attached. Back home, I will download image files from iCloud and the DSLR's flash card, process them, and have them uploaded into Google Photo using Google Backup & Sync. After my last trip, however, the order of uploaded images in Google Photo seemed to be random instead of chronological. So I did analyse the problem and have devised a solution. Problem Google Photo uses the DateTimeOriginal value in the EXIF part to order images chronologically. You can create different orders when you arrange images in an album, but that's another step. In addition to the DateTimeOriginal, GooglePhoto interprets the GPS location, if any, of images to determine the time zone and internally recalculate a universal DateTimeOriginal (it will display the unchanged EXIF DateTimeOriginal-value). It turned out that some of my images simply had a wrong DateTimeOriginal (I adjusted the DSLR