Jeff Geerling personal blog

NIST was 5 μs off UTC after last week's power cut

If you were 5 microseconds late today, blame it on NIST. Their facility in Boulder Colorado just had its power cut for multiple days. After a backup generator failed, their main ensemble clock lost track of UTC, or Universal Time Coordinated. But even if you used the NTP timing servers they run, they were never off by…
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Dec 22, 2025NIST was 5 μs off UTC after last week's power cut by jtokoph335157

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