[3] [CITE@en[RFC 867 - Daytime Protocol]], [TIME[2021-01-24T15:35:06.000Z]], [TIME[2021-03-10T06:22:59.283Z]] <https://tools.ietf.org/html/rfc867>

[1] [CITE@en[NIST Internet Time Service (ITS) | NIST]], [TIME[2021-01-16T00:01:31.000Z]], [TIME[2021-01-16T07:39:36.047Z]] <https://www.nist.gov/pml/time-and-frequency-division/time-distribution/internet-time-service-its>

[2] [[ACTS]] 形式とは少し違う。