The Lightroom (V 6.10) metadata for videos of this camera display a wrong time stamp - with an offset of two hours before the actual time of recording. This problem does not exist for photos.
I have checked the metadata included in the MP4-file with EXIFTOOL - there the time stamp is correct. So my conclusion is that the camera is not the origin of the problem.
(speculation: this offset might be related to my time zone, which is two hours ahead of GMT (CETS))
This problem results from a poorly written Quicktime / MPEG-4 specification, forcing LR to read non-standard, undocumented manufacturer- and camera-specific metadata fields to find the time zone. This isn't that hard, though Adobe has resisted it for many years, and apparently their lawyers take a very conservative view of reading manufacturer-specific metadata without permission from the manufacturer. They recently did this for the iPhone (but it's taken several releases to get it right), and they've said recently they're doing it for at least some Canon models. See this topic in the official Adobe feedback forum: Lightroom: Canon 5D Mark IV video capture time incorrect | Photoshop Family Customer Community . Be sure to add your me-too vote and details of your camera.