This is written at 2021-11-30 15:45 2021-11-27 00:00:00 NTP servers start advertising leap=1. 2021-11-28 00:00:00 Many of these servers execute leap procedure. Leap=0 no longer advertised (mostly) 2021-11-30 00:00:00 *Another set of NTP servers start advertising leap=1.* 2021-12-01 00:00:00 (predicted). Many of the second set of NTP servers execute leap procedure. 2021-12-01 00:00:00 (?) Unknown number of clients will execute leap procedure.
By convention NTP servers wait until the last day of the month before advertising leap=1. Beginning 2021-11-30 00:00:00 I've seen 81 public NTP servers with the leap flag set. The flag flips between 0 and 1 on some servers. In older NTP implementations a single bad leap=1 indicator could propagate to other NTP servers. That may be happening now. (Newer ntpd versions implement a majority rule). I'm working with the NTP Pool folks. Perhaps some of the bad flags can be cleared. However, it is likely that some NTP clients will execute a leap second procedure in about 8 hours. NOTE: In past days this discussion would happen on the NTP mailing lists ( lists.ntp.org), but that mailing list is long dead. Steve Sommars _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.