On Tue, Jan 03, 2017 at 05:34:11PM -0500, Phillip Hallam-Baker wrote: > As I said, I want 30-100 years lead time so I can bake the schedule into > devices and remove a trust dependency. 30 years' lead time for leap seconds? Can't be done. Leap seconds depend on events such as earthquakes. You can estimate their frequency, but you can't estimate when they'll be inserted. Nico --