NIST Internet Time Service (ITS) | NIST
https://www.nist.gov:443/pml/time-and-frequency-division/time-distribution/internet-time-service-its
WEBFeb 10, 2010 · The name of a positive leap second is 23:59:60, but digital time formats, which represent the current time as the number of seconds that have elapsed since some origin (NTP, for example), cannot represent that time. The NIST time servers add the extra leap second by stopping the clock for one second at 23:59:59.
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