[SEA-TIME] CUC time codes are not required to be secondd

Lux, Jim (US 430E) james.p.lux at jpl.nasa.gov
Tue Oct 20 09:12:38 EDT 2026


While 301.0-B "recommends" 1958 as epoch, and counting in seconds, it's not a requirement. There's also a reference in one of the annexes saying "The code allows for both absolute time (TAI scale) and time measured relative to an Agency defined epoch. Various allowed truncations of the code make it bit-efficient. The attributes
of this code make it suitable for applications such as spacecraft clock measurement. "


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James Lux
Data Standards Program Manager

4200 Telecom Programs and Oversight

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jimlux at jpl.nasa.gov<mailto:jimlux at jpl.nasa.gov>






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