Steve Allen wrote: > On Thu 2018-07-19T04:14:12+0100 Stephen Colebourne hath writ: >> "In addition, there is no standard method for applying this frequency >> adjustment, so that different implementations may disagree among >> themselves in addition to the time error with respect to UTC." > > That quote is not from Microsoft, but rather from the > ION paper by Matsakis, Levine, and Lombardi > That can be got by ION members, or from USNO if their > webserver recovers, or from researchgate if you can > tolerate the javascript that will try to execute > https://www.researchgate.net/publication/323600621_Metrological_and_legal_traceability_of_time_signals
Thanks for the pointers. > Microsoft seems to be documenting a new mode of OS configuration which > actually does count the second named "60", and specifically in order > that Microsoft systems can say they conform to MiFID II and other > regulatory agencies that demand conformance with UTC as defined. > Otherwise the old default configuration will have a second that lasts > 2000 millis. I wonder what you mean by "old configuration". The latest leap second tests I made with Windows and w32time running showed that there was no leap second handling at all. This means whenever w32time polled an NTP server the next time after a leap second (which could be up to 1 week, with a 1 week polling interval for machines that are not members oof an Active Directory)) it simply observed a time offset > 1 s, and adjusted the Windows time accordingly. Slewing the Windows system time over 2 seconds is a feature of the ntpd port for Windows (and the Meinberg time adjustment service for their PCI cards), which implements this slewing as a workaround for windows. If Windows starts to provide an API to handle leap seconds then these programs should use the API, if it is available, and skip the workaround. Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: [email protected] Phone: +49 5281 9309-414 Linkedin: https://www.linkedin.com/in/martinburnicki/ Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322 Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung Websites: https://www.meinberg.de https://www.meinbergglobal.com Training: https://www.meinberg.academy _______________________________________________ LEAPSECS mailing list [email protected] https://pairlist6.pair.net/mailman/listinfo/leapsecs
