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Saturday, July 11, 2026
- jreicherhttps://en.wikipedia.org/wiki/GPS_week_number_rollover !!!!!!
- nevetGPS week number rollover - Wikipedia
- jreicherI used to run a timeserver, and although I know about leap seconds, I never heard of this before.
- julemand101jreicher: Head about it 7 years ago from this video: https://www.youtube.com/watch?v=iyz7dSnZItw
- nevetYouTube: Why didn't GPS crash? | Stand-up Maths
- jreicherInteresting. This guy is sponsored by Jane Street.
- ParaWhat is time? We just don't know.
- ParaJeff Geerling has some content on running a modern accurate timeserver. It's apparently still quite hard.
- jreicherTime is a function of entropy. :p
- jreicherRegarding difficulty, it depends how accurate you want to be. I let ntp do most of the work and applied for permission to connect to some stratum 1 servers because I was contributing mine to the public ntp pool. I think I was within 100ms most of the time.
- jreicherThe funniest thing was seeing the time drift with ambient temperature changes through the day though. I'm guessing it affected the crystal on the clock chip; I don't think it could have been anything else.
- jreicherIt was almost a perfect sine wave sometimes
- ChronosPara: I follow Jeff Geerling on YouTube. I had no idea keeping accurate time could be such a rabbit hole! And I like it that Java has good date/time functionality built into the standard library. Just trying to keep things on-topic. ;)
- ParaJava got it wrong, then horribly wrong, then kinda right, exactly right, and finally almost right.
- ChronosPara: Heh! Better late than never! ;)
- dreamreal.. eventually
- jreicherPara: what do you mean? What did Java do?
- Paratime
- deeboZonedDateTime extends FlatCircle
- ParaZybourneClock extends Clock