On a lot of jobs I work with three bodies, and keeping the camera's internal clocks syncronised is extremely important. Canon internal clocks seem to drift fairly quickly, so the time-sync thing happens every couple of weeks. For years I've hooked up to EOS Utility-2, followed the steps and synced bodies to Mac time. EOS Utility-3 has a slightly different process, but the result should be the same. There is the offer to sync with Mac time, but it just doesn't happen. The 5D MkIV is not recognised by EOS Utility-2, so time syncing bodies has become a tedious, imprecise manual process. FWIW I'm on OSX Sierra.
Am I alone with this glitch? Is there a stand-alone app available to achieve time-sync?
-pw