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.