While all leap seconds so far have been positive, that is not a requirement. Negative leap seconds are a possibility - one accounted for in any valid implementa

While all leap seconds so far have been positive, that is not a requirement. Negative leap seconds are a possibility - one accounted for in any valid implementation. More significant for this particular suggestion, leap seconds do not occur/become necessary on any nice linear basis. They are tragically bound to the rotation of the Earth, which does not care about what would be nice for us and changes in a non-linear fashion.