On Wed 2019-01-16T00:00:55-0800 Paul Hirose hath writ: > The "rubber second" era is supported. That accounted for about 90% of the > workload to create the UTC implementation!
Does it know that rubber seconds do not apply to timestamps in central Europe made using DCF77 from 1970-01-01 to 1972-01-01? After the CGPM redefined the SI second in terms of cesium the German time service bureau determined that they could not use the old scheme of BIH UT2 with its rubber seconds. They had convinced themselves that German law required them to broadcast SI seconds. So starting 1970-01-01 DCF77 changed to broadcast Stepped Atomic Time (SAT) with second markers that were 1 SI second apart except on occasions when they were 1.2 SI seconds apart in order that the time markers would stay close to UT2. This was one of the issues of concern in the CCIR preparatory meetings that led to the decision to have leap seconds. So they were mostly broadcasting legal SI seconds, but too early in history to evoke comparisons with "mostly harmless" and "mostly dead". -- Steve Allen <s...@ucolick.org> WGS-84 (GPS) UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855 1156 High Street Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 https://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list LEAPSECS@leapsecond.com https://pairlist6.pair.net/mailman/listinfo/leapsecs