Coordinated Universal Time
From FIS Freestyle wiki

Coordinated Universal Time (UTC, French: Temps Universel Coordonné) is a time standard based on International Atomic Time (TAI) with leap seconds added at irregular intervals to compensate for the Earth's slowing rotation. Leap seconds are used to allow UTC to closely track UT1, which is mean solar time at the Royal Observatory, Greenwich.
The difference between UTC and UT1 is not allowed to exceed 0.9 seconds, so if high precision is not required the general term Universal Time (UT) may be used.
In casual use, Greenwich Mean Time (GMT) can be considered equivalent to UTC or UT1 when fractions of a second are not important. Owing to the ambiguity as to whether UTC or UT1 is meant, GMT is generally avoided in technical contexts.
Time zones around the world can be expressed as positive or negative offsets from UTC; UTC replaced GMT as the basis for the main reference time scale or civil time in various regions on January 1, 1972.
![Length of day offset to 86400 s TAI over the last 365 days completed by 180 day prediction. see [1]](/images/thumb/300px-Img_LOD.png)
[edit] Also See:
- Freestyle Timing Booklet
- Data Service Requirements World Cup
- Freestyle Equipment List
- Hour
- second
- Leap second
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