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Frequently asked questions (FAQ) index 

Here are some frequently asked time and frequency questions grouped by category. If you have a question, look for an answer here! We'll add new questions to this list as we receive them.

Precision  The current time, precision methods, and atomic clocks.
Leaps  Leap years and leap seconds.
History  General history, hours, minutes, & seconds, international agreement, time zones, and more.
 Government  The role of the United States in timekeeping, and international cooperation.
Broadcast  Time signals broadcast by radio, telephone, and Internet.
Misc  Year 2000, UTC, GMT, daylight saving, and other related questions.