https://groups.google.com/a/list.nist.gov/g/internet-time-service/c/Zd7VaR-vqV4
On Saturday, 6 December 2025 at approximately 21:13 UTC, the atomic time source (a single cesium beam atomic clock) for all the internet time servers at the NIST Gaithersburg campus failed and exhibited a time step of approximately -10 ms.
Oh.
