Hi léonie
No not different timezones. This happens with photos and videos taken at same time and happens wether I'm in England (where I live) or elsewhere.
Interestingly it doesn't happen with photos and videos taken with my iPhone. Only with camera or GoPro.
Strangely iPhoto/Aperture has no problem displaying correctly nor does another app I use for date/time changing.
Your explanation seemed to make sense, so on the back of that I just used EXIFTOOL to look at the EXIF info in the background of two photos and two videos taken at same time. One set of photo and video from camera and one set from iPhone.
Even more interestingly the iPhone movie file shows the create date an hour earlier than actually taken! So it seems Apple are preparing the EXIF data in the file so that it is read correctly by Photos? But that doesn't explain why it displays correctly in iPhoto/Aperture. I thought it may be something simple I was missing but it is obviously more complicated, and very annoying.
