Might be a Mac OS fail, because the timestamp value when my video files are created is no longer recognised. The files show created date/time as the moment I inserted the SD card. Using LR5 on 2009 series MacBookPro running Mac OS Sierra 10.12.5. Video files recorded on either Nikon D810 as .mov, or my Panasonic Lumix TS-6 as .mp4. Do not recall having this problem last year.