Leap second and UT1-UTC information
sources: https://www.nist.gov/pml/time-and-frequency-division/time-realization/leap-seconds his page is updated monthly and contains a table of leap seconds, the current difference between the UT1 and UTC time scales, and the current UT1 – UTC difference that is being broadcast by NIST (called the DUT1 correction). The master clock pulses used by the WWV, WWVH, WWVB, ACTS and Internet Time Service (ITS) time code transmissions are referenced … Read more