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Displayable utc clock7/3/2023 When a leap second is inserted, the time, as it nears midnight, proceeds from 23 hours 59 minutes 59 seconds to 23 hours 59 minutes 60 seconds (the inserted leap second), and then to 0 hours 0 minutes 0 seconds (midnight). Adding a leap second is referred to as a "leap second insertion". The International Earth Rotation and Reference Systems Service (IERS) determines when a leap second will be added. A leap second adjustment keeps UTC tracking time within a second of the average length of a day.Īs of this writing, 27 leap seconds have been added since the practice of inserting leap seconds began in 1972. That's because the earth's rotation speed is irregular, and in general is slowing down over time by about one second every 1.5 years (although sometimes the earth's rotation speed increases). There's a discrepancy between the time kept by atomic clocks, and the time kept by tracking the rotation of the earth. However, a leap second is occasionally added to UTC time to keep the difference between UTC time and UT1 (solar time) within +- 0.9 seconds. The rate of UTC time is based on International Atomic Time (TAI) which uses atomic clocks to track time. This clock accounts for leap seconds and is the basis for civil time around the world. This clock measures time since 00:00:00 UTC on Thursday, January 1, 1970. Local time is adjusted from UTC time depending on your time zone. ![]() A clock for Coordinated Universal Time (UTC) which is sometimes popularly referred to as Greenwich Mean Time (GMT) or Zulu time.
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