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How Many Time Zones Are There?

If each time zone were 1 hour apart, there would be 24 in the world. But several time zones have only 30 and 45 minutes offsets, making the total number worldwide much higher.

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More Than 24 Time Zones

If each time zone were 1 hour apart, there would be 24 in the world.

However, the International Date Line (IDL) creates 3 more. Also, several time zones are only 30 or 45 minutes apart, increasing the total number of standard time zones even further.

Daylight Saving Time Zones

During Daylight Saving Time (DST) the time zone name and time changes. The words “daylight” or “summer” are then usually included in the name, and the local time is usually set forward 1 hour.

For example, California uses Pacific Daylight Time (PDT) during the DST period with a UTC offset of UTC-7, but Pacific Standard Time (PST) with an offset of UTC-8 during the rest of the year.

Not the Same as Local Time

The term time zone is often confused with local time. For instance, during DST, it is common to say “California and Arizona are now in the same time zone.” However, the correct thing to say would be: “California and Arizona now have the same local time.”

The reason it may be confusing is that California's local time during DST is UTC-7, but the standard time in California is UTC-8. However, Arizona's local time is always UTC-7, because there's no DST in Arizona, and they remain on standard time all year.

Time Zone Borders Vary

Theoretically, each 1-hour time zone is 15 degrees wide, indicating a 1-hour difference in mean solar time. This can be seen as the white and gray stripes on our Time Zone Map and in the image above.

The actual borders on a time zone map have been drawn to correspond with both internal and international borders, and rarely match up exactly with the 15-degree time zone borders.

Some geographically large (wide) countries, like India and China, use only 1 time zone, while it would have been natural to expect several, like in the US or Australia.

Defined by UTC Offset

Every place on Earth is measured in terms of its distance east or west of the prime meridian (0°longitude) in Greenwich, London, United Kingdom. This is also the reference point for Coordinated Universal Time (UTC) with 1 hour per 15 degrees longitude.

You have to divide the longitude, in degrees, by 15 to find the appropriate time zone, in hours. For example:

  • At 150 degrees west (or 150° W) longitude, the time should be 150 degrees divided by 15 degrees = 10 hours behind UTC, or UTC-10.
  • At 75 degrees east (or 75° E) longitude, the time would be 75 degrees divided by 15 degrees = 5 hours ahead of UTC, or UTC+5.

Below are all the different local times currently in use worldwide.

Currently 38 Different Local Times in Use

UTC OffsetLocationsExample NameExample Location
UTC +14Christmas Island/KiribatiLINTKiritimati
UTC +13Tonga and 3 moreTOTNukualofa
UTC +12:45Chatham Islands/New ZealandCHASTChatham Islands
UTC +12New Zealand with exceptions and 9 moreANATAnadyr
UTC +11small region of Russia and 6 moreSBTHoniara
UTC +10:30Lord Howe Island/AustraliaLHSTLord Howe Island
UTC +10much of Australia and 6 moreAESTMelbourne
UTC +9:30some regions of AustraliaACSTAdelaide
UTC +9Japan, South Korea and 4 moreJSTTokyo
UTC +8:45Western Australia/AustraliaACWSTEucla
UTC +8:30North KoreaPYTPyongyang
UTC +8China, Philippines and 11 moreCSTBeijing
UTC +7much of Indonesia, Thailand and 7 moreWIBJakarta
UTC +6:30Myanmar and Cocos IslandsMMTYangon
UTC +6Bangladesh and 6 moreBSTDhaka
UTC +5:45NepalNPTKathmandu
UTC +5:30India and Sri LankaISTNew Delhi
UTC +5Pakistan and 8 moreUZTTashkent
UTC +4:30Iran and AfghanistanIRDTTehran
UTC +4Azerbaijan and 8 moreGSTDubai
UTC +3Greece and 38 moreMSKMoscow
UTC +2Germany and 45 moreCESTBrussels
UTC +1United Kingdom and 23 moreBSTLondon
UTC +0Iceland and 17 moreGMTAccra
UTC -1Cabo VerdeCVTPraia
UTC -2most of Greenland and 3 moreWGSTNuuk
UTC -2:30Newfoundland and Labrador/CanadaNDTSt. John's
UTC -3most of Brazil, Argentina and 9 moreARTBuenos Aires
UTC -4regions of USA and 33 moreEDTNew York
UTC -5regions of USA and 9 moreCDTMexico City
UTC -6small region of USA and 10 moreCSTGuatemala City
UTC -7regions of USA and 2 morePDTLos Angeles
UTC -8Alaska/USA and 2 moreAKDTAnchorage
UTC -9Alaska/USA and regions of French PolynesiaHADTAdak
UTC -9:30Marquesas Islands/French PolynesiaMARTTaiohae
UTC -10Hawaii/USA and 2 moreHASTHonolulu
UTC -11American Samoa and 2 moreNUTAlofi
UTC -12much of US Minor Outlying IslandsAoEBaker Island

25 Common One-Hour Time Zone Offsets

UTC OffsetLocationsExample NameExample Location
UTC +12New Zealand with exceptions and 9 moreANATAnadyr
UTC +11small region of Russia and 6 moreSBTHoniara
UTC +10much of Australia and 6 moreAESTMelbourne
UTC +9Japan, South Korea and 4 moreJSTTokyo
UTC +8China, Philippines and 11 moreCSTBeijing
UTC +7much of Indonesia, Thailand and 7 moreWIBJakarta
UTC +6Bangladesh and 6 moreBSTDhaka
UTC +5Pakistan and 8 moreUZTTashkent
UTC +4Azerbaijan and 8 moreGSTDubai
UTC +3Greece and 38 moreMSKMoscow
UTC +2Germany and 45 moreCESTBrussels
UTC +1United Kingdom and 23 moreBSTLondon
UTC +0Iceland and 17 moreGMTAccra
UTC -1Cabo VerdeCVTPraia
UTC -2most of Greenland and 3 moreWGSTNuuk
UTC -3most of Brazil, Argentina and 9 moreARTBuenos Aires
UTC -4regions of USA and 33 moreEDTNew York
UTC -5regions of USA and 9 moreCDTMexico City
UTC -6small region of USA and 10 moreCSTGuatemala City
UTC -7regions of USA and 2 morePDTLos Angeles
UTC -8Alaska/USA and 2 moreAKDTAnchorage
UTC -9Alaska/USA and regions of French PolynesiaHADTAdak
UTC -10Hawaii/USA and 2 moreHASTHonolulu
UTC -11American Samoa and 2 moreNUTAlofi
UTC -12much of US Minor Outlying IslandsAoEBaker Island

2 Additional One-Hour Time Zone Offsets

UTC OffsetLocationsExample NameExample Location
UTC +14Christmas Island/KiribatiLINTKiritimati
UTC +13Tonga and 3 moreTOTNukualofa

8 Half-Hour Time Zone Offsets

UTC OffsetLocationsExample NameExample Location
UTC +10:30Lord Howe Island/AustraliaLHSTLord Howe Island
UTC +9:30some regions of AustraliaACSTAdelaide
UTC +8:30North KoreaPYTPyongyang
UTC +6:30Myanmar and Cocos IslandsMMTYangon
UTC +5:30India and Sri LankaISTNew Delhi
UTC +4:30Iran and AfghanistanIRDTTehran
UTC -2:30Newfoundland and Labrador/CanadaNDTSt. John's
UTC -9:30Marquesas Islands/French PolynesiaMARTTaiohae

3 Quarter-Hour Time Zone Offsets

UTC OffsetLocationsExample NameExample Location
UTC +12:45Chatham Islands/New ZealandCHASTChatham Islands
UTC +8:45Western Australia/AustraliaACWSTEucla
UTC +5:45NepalNPTKathmandu

Coordinated Universal Time (UTC)

20:53:27

Thursday, July 27, 2017

UTC is the common time standard across the world

More about UTC

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Time Zone Map With DST

Time Zone Map


Time Zone Library

  1. What Is a Time Zone?
  2. How Many Time Zones Are There?
  3. What Is Standard Time?
  4. Half Hour & 45 Minute Time Zones
  5. What's the International Date Line?
  6. Why Do We Have Time Zones?

Time Zones Worldwide

Time Zone Tools

Daylight Saving Time Changes:

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