2019-07-12-----2025-06-11 time.nist.gov

2022-10-10-----2025-02-22 time.friendsschoolboulder.org

2024-10-25-----2024-10-25 ntp.kerji.org

2023-08-18-----2024-05-14 time.nasa.gov

2024-05-14-----2024-05-14 time2.okhot.net

2022-11-09-----2022-11-09 time.liangke.net

2020-01-05-----2022-10-23 ntp1.glb.nist.gov

2022-05-29-----2022-06-20 time-e-g.nist.gov