2016-12-29-----2025-06-16 time-b.nist.gov

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2023-12-29-----2023-12-29 time.redflagblog.org

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2018-03-28-----2023-04-05 time-b-g.nist.gov

2016-12-09-----2020-10-27 time.nist.gov

2020-01-05-----2020-02-07 ntp1.glb.nist.gov