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Remember the GPS week rollover? Many receivers also use the Russian GLONASS which has a day-rollover every 4 years. This happened at 21:00 UTC 31st of December & it caused actual outages.https://twitter.com/GalileoSats/status/1213022044931145730 …
GLONASS internally runs on Moscow wall clock time, which is UTC+3. It has leap seconds. Dates are specified as day numbers starting from 1 & go up to 1461, within a four-year plan. The GLONASS n4 year number went from 6 to 7 on the 31st:https://twitter.com/GalileoSats/status/1213031666026983424 …
And the day number NT from 1461 to 1. Soviet mathematicians apparently counted from 1:https://twitter.com/GalileoSats/status/1213032041996005376 …
And finally link to some outage discussions: https://mailman.nanog.org/pipermail/nanog/2019-December/105053.html … & https://lists.dns-oarc.net/pipermail/dns-operations/2020-January/019560.html …
Oh and to clarify, this was not a GLONASS problem but a receiver firmware problem.
And finally finally some problems appear to have started earlier than the actual rollover so perhaps it is not as simple as this.
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