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Saturday, July 11, 2026

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10:52:16jreicherhttps://en.wikipedia.org/wiki/GPS_week_number_rollover !!!!!!
10:52:16nevetGPS week number rollover - Wikipedia
10:52:45jreicherI used to run a timeserver, and although I know about leap seconds, I never heard of this before.
10:58:42julemand101jreicher: Head about it 7 years ago from this video: https://www.youtube.com/watch?v=iyz7dSnZItw
10:58:42nevetYouTube: Why didn't GPS crash? | Stand-up Maths
11:05:28jreicherInteresting. This guy is sponsored by Jane Street.
11:10:19ParaWhat is time? We just don't know.
11:11:35ParaJeff Geerling has some content on running a modern accurate timeserver. It's apparently still quite hard.
11:12:16jreicherTime is a function of entropy. :p
11:14:11jreicherRegarding 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.
11:15:07jreicherThe 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.
11:15:19jreicherIt was almost a perfect sine wave sometimes
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13:59:24ChronosPara: 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. ;)
14:00:08ParaJava got it wrong, then horribly wrong, then kinda right, exactly right, and finally almost right.
14:02:49ChronosPara: Heh! Better late than never! ;)
14:17:03dreamreal.. eventually
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14:18:16jreicherPara: what do you mean? What did Java do?
14:18:29Paratime
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14:50:39deeboZonedDateTime extends FlatCircle
15:03:54ParaZybourneClock extends Clock
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