Articles About Time Zone (30)

Time zone map illustration showing time zones for the whole world.

UTC: The World’s Time Standard

What is UTC time? Find out how Coordinated Universal Time is measured, what it means for you, and how you can use it to state the time in any time zone.

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.

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.

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.

Internet Time

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

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?

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.

What Time Is It at the North Pole?

Without any fixed time zone or normal daylight hours, how can you tell the time in the Arctic? Researchers at the poles need to find clever solutions.

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.

A view of Apia’s harbor with a rainbow in the sky showcases Samoa’s vibrant culture and natural beauty. In 2011, Samoa shifted its time zone to align with Australia and New Zealand, strengthening ties in a radical change.

How Are Time Zones Decided?

And what makes a country change its time zone? Is it based on geography, politics, relationships—or all of the above?

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.

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.

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).

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”?

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.

Interactive Timezone Map from timeanddate.com

What Is a Time Zone?

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

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?

Skyline of downtown Indianapolis, Indiana, USA.

Time Zones in Indiana

In Indiana, USA, there are two time zones: Central Time and Eastern Time. All counties observe Daylight Saving Time (DST). Find Indiana on our Time Zone Map.

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?

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.

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.

What Are Longitudes and Latitudes?

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

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?

In 2019, the European Union seemed intent on scrapping DST. Now they're taking steps to rescind the proposal.

Daylight Saving Time and Time Zones in Europe

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

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).

Why Is There Only One Time Zone in China?

In spite of its size being almost the same size as the continental USA, China has only one official time zone: Beijing Time.