NTP.

By any other standard, most manually set clocks are up to a full minute off all the time.

Yeah, but we're thinking of systems where nanoseconds matter.

MiFID 2 alone forces sub-μs precision. Million times less than the leap 1 second.

NTP minute away is good for displaying date on the workstation, not for many of the devices that are critical to the modern world.

dont most systems that rely on sharp timing simply manage it themselves.

	▲	subscribed a day ago \| parent [-]
		Yesno. Sure they have their own time servers fed from the GPS, but they need to be _accurate_ in relation to the world. But timestamps used by companies forced to use very accurate timing must be synchronised to UTC.