How to convert UTC time to your local time?

Universal Time (UT1)

When we measure time based on the Earth’s rotation relative to the Sun, it is called solar time. As solar time is used universally, that’s why it’s called Universal Time (UT1). The International Earth Rotation and Reference Systems Service (IERS) always monitors the Earth’s rotation and Universal Time (UT1).

Now the rotation of the earth is gradually slowing due to the tidal force of the moon and the mean solar day is gradually increasing. Due to this trouble, Coordinated Universal Time (UTC) comes into place.

Coordinated Universal Time (UTC)

When we measure time based on the oscillations of atoms (International Atomic Time), it is called Coordinated Universal Time (UTC), and it is always adjusted to remain within 0.9 seconds of Universal Time (UT1) by occasionally adding a “leap second.”

UTC is the standard reference for time zones around the world and is used by GPS. 

Time zones

Time zones on the world map
View larger. Time zones on the world map. Here, the vertical light green stripe in the middle on the world map shows UTC (0), which is the Greenwich Mean Time (GMT) zone.

A time zone is an area that exhibits the same local time for legal, commercial, and social purposes.

Many time zones have been created on the world map by simply adding or subtracting hours from UTC. For instance, the time zone, Greenwich Mean Time (GMT), is set equal to UTC, and other time zones range from UTC – 12 hours to UTC + 14 hours.

Time zones that are located east of Greenwich Mean Time (GMT) are ahead of UTC, and time zones that are located west of Greenwich Mean Time (GMT) are backward of UTC.

Please remember UTC is a reference time which is always synchronized with Universal Time and GMT is a time zone which is equals to UTC time.

Convert UTC time to your local time

The Americas

Hawaii Standard Time (HST ) = UTC – 10 hours

Alaska Standard Time (AKST) = UTC – 9 hours

Alaska Daylight Time (AKDT) = UTC – 8 hours

Pacific Standard Time (PST) = UTC – 8 hours

Pacific Daylight Time (PDT) = UTC – 7 hours

Mountain Standard Time (MST) = UTC – 7 hours

Mountain Daylight Time (MDT) = UTC – 6 hours

Central Standard Time (CST) = UTC – 6 hours

Central Daylight Time (CDT) = UTC – 5 hours

Eastern Standard Time (EST) = UTC – 5 hours

Eastern Daylight Time (EDT) = UTC – 4 hours

Atlantic Standard Time (AST) = UTC – 4 hours

Atlantic Daylight Time (ADT) = UTC – 3 hours

Newfoundland Standard Time (NST) = UTC – 3.5 hours

Newfoundland Daylight Time (NDT) = UTC – 2.5 hours

Please note that most American countries observe Daylight Saving Time, which starts at 2 a.m. on the second Sunday of March and ends at 2 a.m. on the first Sunday of November every year. You have to add one hour to the standard time to get Daylight Saving Time.

Europe, Africa and the Middle East

Greenwich Mean Time (GMT) = UTC + 0 hour

British Summer Time (BST) = UTC + 1 hours

Central European Time (CET) = UTC + 1 hours

Central European Summer Time (CEST) = UTC + 2 hours

Eastern European Time (EET) = UTC + 2 hours

Eastern European Summer Time (EEST) = UTC + 3 hours

Moscow Standard Time (MSK) = UTC + 3 hours

Turkey Time (TRT) = UTC + 3 hours

Saudi Arabia Standard Time (SAST) = UTC + 3 hours

Gulf Standard Time (GST) = UTC + 4 hours

Most European countries also observe Daylight Saving Time. In Europe, Daylight Saving Time is referred to as Summer Time, which starts at 1 a.m. GMT on the last Sunday of March and ends at 1 a.m. GMT on the last Sunday of October every year. You have to add one hour to the standard time to get Summer Time.

Asia and Oceania

Afghanistan Time (AFT) = UTC + 4.5 hours

Pakistan Standard Time (PKT) = UTC + 5 hours

Indian Standard Time (IST) = UTC + 5.5 hours

Bangladesh Standard Time (BST) = UTC + 6 hours

Indochina Time (ICT) = UTC + 7 hours

China Standard Time (CST) = UTC + 8 hours

Australian Western Standard Time (AWST) = UTC + 8 hours

Japan Standard Time (JST) = UTC + 9 hours

Australian Central Time (ACT) = UTC + 9.5 hours

Australian Eastern Standard Time (AEST) = UTC + 10 hours

New Caledonia Time (NCT) = UTC + 11 hours

New Zealand Standard Time (NZST) = UTC + 12 hours

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About the Author

Ashim

Ashim Chandra Sarkar founded Space & Telescope in 2022. He holds a M.Sc. in physics and has five years of research experience in optical astronomy. His passion for astronomy inspired him to open this website. He is responsible for the editorial vision of spaceandtelescope.com.

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