On Jul 30, 8:04 am, Andrzej Krzemienski wrote:

- The rationale at the end says that leap seconds would be difficult to implement. - My experiments with simple ptime subtraction suggest no leap second support.

I am really confused.

The confusion cannot go away for retrospective calculations with UTC. See the javascript program and text on this web page http://www.ucolick.org/~sla/leapsecs/epochtime.html The scenario in that example helps to explain why it is that the international committees have been unable to produce a consensus on changes to UTC. The delegates are constrained by the legal history of the nations they represent. -- Steve Allen WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m