I usually shoot a football game using two cameras. When I publish a gallery I want images from both cameras to appear as a single stream. Of course that is easily done by using a naming scheme that puts an alphanumerically sortable timestamp right after the event’s invariant name. But that only works if both cameras have been synchronized before the event starts… Of course I forgot to do it. No problem – Exiv2 comes to the rescue ! A simple ‘exiv2 ad -a 48:08:30 *’ saved my day (actually two days, eight minutes and thirty seconds)… Thank you Exiv2 !