Articles About Time Zone (27)

UTC: The World’s Time Standard

Coordinated Universal Time (UTC) is the basis for civil time today. This 24-hour time standard is kept using highly precise atomic clocks combined with the Earth's rotation.

UTC & GMT – Same Difference?

Greenwich Mean Time (GMT) is often interchanged or confused with Coordinated Universal Time (UTC). But GMT is a time zone and UTC is a time standard.

GMT or BST in the UK?

The UK is not on Greenwich Mean Time (GMT) all year. During Daylight Saving Time the correct time zone is British Summer Time (BST).

Skyline of downtown Indianapolis, Indiana, USA.

Time Zones in Indiana

In Indiana, USA, there are are two time zones: Central Time and Eastern Time. All counties set their clocks one hour to and from Daylight Saving Time (DST) twice a year. Indiana time zone map with local time in each county.

Fifth Avenue Clock with the Flatiron Building at the background in New York City.

What Is Standard Time?

Standard time is also known as winter time or normal time in some countries.

Miller map projection of the world with the imaginary International Date Line (IDL) drawn down the image. The Midway Islands, Kiribati, Tonga, and Chatham Islands are labelled on the map.

What Is the International Date Line?

The International Date Line goes through the Pacific Ocean at about 180 degrees longitude. Where is the International Date Line? See it on a time zone map.

Illustration of two people from different sides of the world, talking on the phone.

What Is a Time Zone?

A time zone refers to any region where the same standard time is kept. Interactive Time Zone Map for current time zones worldwide.

Map showing DST areas for Navajo in Arizona.

No DST in Most of Arizona

Most of the US state of Arizona does not use Daylight Saving Time (DST). The exception is the Navajo Nation.

Storm rising over United States Capitol Building, Washington DC

DST in the United States

When did Daylight Saving Time start in the US? Which states use it, and why?

Daylight Saving Time and Time Zones in Europe

When does Daylight Saving Time start and end in Europe? How many time zones are there?

What Are Longitudes and Latitudes?

Cartographers and geographers divide the Earth into longitudes and latitudes in order to locate points on the globe.

Time Zones in Australia and New Zealand.

Australia's Time Zones

Australia has multiple time zones. Some of them are half-hour and quarter-hour time zones. Not all states and territories use Daylight Saving Time (DST).

Half Hour and 45-Minute Time Zones

While most time zones differ from Coordinated Universal Time (UTC) by a number of full hours, some time zones have 30-minute or 45-minute offsets.

Why Do We Have Time Zones?

The expansion of transport and communication during the 19th century created a need for a unified time-keeping system, and time zones were introduced.

The Shepherd Gate Clock on the wall at the Royal Observatory Greenwich.

UK Time Zone History

Learn about the interesting history of time zones in the United Kingdom. What is Railway Time? How did DST begin? Why was BDST briefly introduced?

Radio telescopes of the Very Large Array in New Mexico, USA.

What Is Universal Time?

Universal Time is a solar time standard used in astronomy and to define time on Earth. How is it measured? What's the difference between UT, UT0, UT1, UT2, and UTC?

Why UTC – not CUT?

The abbreviation for Coordinated Universal Time is UTC. Why is it not abbreviated as “CUT” or “TUC”?

Internet Time

What is Internet Time, and how to convert between the time zones and beats.

Interactive Timezone Map from timeanddate.com

What Is a Time Zone?

The term time zone can be used to describe several different things.

New Year Trivia

Toast the New Year 38 times with our new year countdown. 26 hours after the first bottle pops on Kiritimati in the Pacific, Baker Island greets the New Year.

Which Country Has the Most Time Zones?

You probably won’t guess the country with the most time zones. Hint: It’s neither Russia nor the USA.

A young couple relaxing in an airport lounge.

Jet Lag Tips

What is jet lag, what are the symptoms, and which remedies are recommended?

A C17 Globemaster military cargo plane takes off from a dusty airstrip, with rugged mountains in the background.

Military Time: The 24-Hour Clock

Military Time uses a 24-hour time format and the NATO alphabet. How does it work? Conversion chart: What is 1500 Zulu Time in 12-hour AM/PM format?

A blurry businessman walking toward four clocks stock photo

Understanding UTC Offsets

UTC, or Coordinated Universal Time, is a 24-hour global time standard used to determine time zones worldwide.

The Equator Divides Earth in Two

The equator is an imaginary line dividing Earth into the Northern and Southern Hemispheres. It is located halfway between the North and South poles.

The Northern and Southern Hemispheres

The Northern Hemisphere spans from the equator to the North Pole, while the Southern Hemisphere extends from the equator to the South Pole.

European Parliament building at sunset. Brussels, Belgium.

Is the Sun Setting on DST in the EU?

The European Parliament wants to remove Daylight Saving Time (DST) in the European Union. What does that mean for the countries in Europe? And what about Brexit?