Question 1

What is UTC (Coordinated Universal Time)?

Accepted Answer

UTC is the primary time standard by which the world regulates clocks. It's the successor to GMT and is based on atomic time for precision.

Question 2

What is Daylight Saving Time (DST)?

Accepted Answer

DST is the practice of advancing clocks by one hour during warmer months to extend daylight into the evening.

Question 3

What does GMT stand for?

Accepted Answer

GMT stands for Greenwich Mean Time, the historic time standard based on the Prime Meridian in Greenwich, London.

Question 4

How many time zones are in the USA?

Accepted Answer

The USA and its territories use 9 standard time zones. The 4 contiguous US states time zones are Pacific, Mountain, Central, and Eastern.

Question 5

What are leap seconds?

Accepted Answer

A leap second is a one-second adjustment added to UTC to keep it in sync with the Earth's irregular rotation.

Time Zone Dashboard

Americas