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Articles about Timekeeping (23)

Daylight Saving Time – DST

Daylight Saving Time aka Daylight Savings Time, DST or Summer Time. Clocks go forward 1 hour in the spring and back in the fall to make better use of daylight. more

UTC – Coordinated Universal Time

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. more

What is a Time Zone?

A Time Zone refers to any of 24 regions loosely divided by longitude, where the same standard time is kept. more

International Date Line (IDL)

The International Date Line (IDL) is an imaginary line of longitude on the Earth’s surface located at about 180 degrees east (or west) of the Greenwich Meridian. more

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). more

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. more

The Daylight Saving Time Debate

DST has become a political issue, while others debate whether setting the clocks one hour ahead in the spring has the intended effect of conserving energy or reducing road accidents. more

Intl Atomic Time

International Atomic Time (TAI) is one of the main components of Coordinated Universal Time (UTC), the time scale used to determine local times around the world. more

How leap seconds work

Leap seconds have been added to atomic clocks since 1972. timeanddate.com examines what a leap second is, why it is used and why the earth is slowing down. more

Leap Second - What is it?

Every now and then a leap second is added to Coordinated Universal Time (UTC) in order to synchronize atomic clocks with the Earth's ever slowing rotation. more

Why UTC – not CUT?

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

Alternative Time Systems

Astronomers use other measures of time, such as Terrestrial Time (TT), which is 32.184 seconds ahead of International Atomic Time (TAI). more

Equation of time

Why doesn't the year's earliest sunset not occur on the Winter Solstice, even though it is the shortest day of the year in terms of daylight? more

Timekeeping by stars

How to tell time at night when you don't have a watch or a smartphone readily available and are in the Northern Hemisphere. more

Summer Time or Daylight Saving

Summer Time is often used to describe Daylight Saving Time (DST), especially the United Kingdom. Winter Time instead of Standard Time is also a common variation. more

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