With my Canons, it's been useful to be able to exactly sync the date/time across multiple bodies via EOS Utility on the Mac or PC.
Now that I've introduced the Panasonic GH4 into the mix, I don't see any way to exactly sync the date/time as you can with the Canons.
You can get kind of close manually, but down to the second syncing can really only be usefully achieved via software.
Am I missing something?