When was UTC adopted?
1 January 1960
When was the official abbreviation adopted?
1967
What does it stand for?
Coordinated Universal Time
What is it?
the primary time standard
Who uses it?
the world
How close to is it to mean solar time?
1 second
IS it interchangeable with anything?
yes
What?
Greenwich Mean Time
Is GMT still defined?
no
Does UTC recognize daylight savings time?
no
Have their ever been any adjustments?
yes
What was it once coordinated with?
both UTC and "Stepped Atomic Time
Until what happened?
a new UTC was adopted
When?
1970
When was its implementation?
1972
What did it also adopt?
leap seconds
For what reason?
simplify future adjustments.
It is stated that carrier frequencies should be what?
maintained constant and should correspond to the definition of the SI second
What should be exactly 1 s?
step adjustments,
Why?
to maintain approximate agreement with Universal Time