Time Zones 2.1

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By Anne Buckle. Published 30-Jul-2009

Time in the United States, by law, is divided into nine standard time zones covering the states, territories and other US possessions, with most of the United States observing daylight saving time (DST) for approximately the spring, summer, and fall months. The time zone boundaries and DST observance are regulated by the Department of Transportation.

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  1. Time.is displays exact, official atomic clock time for any time zone (more than 7 million locations) in 51 languages. Automated access is prohibited. Support for cookies and JavaScript is required.
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While most time zones differ from Coordinated Universal Time (UTC) by a number of full hours, there are also a few time zones with both 30-minute and 45-minute offsets.

The local time in a time zone is defined by its difference from Coordinated Universal Time (UTC), the world's time standard.

Not Only Whole Hours

A country in the UTC+3 time zone is 3 hours ahead of UTC; in the UTC-8 time zone, clocks are 8 hours behind UTC.

However, some countries and territories use uneven UTC offsets that differ by 30 or 45 minutes from the usual one-hour time zone interval.

Daylight Saving Time

Regions that use Daylight Saving Time (DST) change the time zone during the DST period. The words 'daylight' or 'summer' are then usually included in the time zone name.

The areas that don't use DST remain on their standard time all year.

India: UTC +5:30

  • Standard time: India Standard Time (IST)
  • Daylight time: None
  • Example city: New Delhi

Australian States:

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

Northern Territory: UTC +9:30

  • Standard time: Australian Central Standard Time (ACST)
  • Daylight time: None
  • Example city: Darwin

Eucla: UTC +8:45

  • Standard time: Australian Central Western Standard Time (ACWST)
  • Daylight time: None
  • Example city: Eucla

South Australia: UTC +9:30 / +10:30

  • Standard time: Australian Central Standard Time (ACST)
  • Daylight time: Australian Central Daylight Time (ACDT)
  • Example city: Adelaide

Broken Hill: UTC +9:30 / +10:30

  • Standard time: Australian Central Standard Time (ACST)
  • Daylight time: Australian Central Daylight Time (ACDT)
  • Example city: Broken Hill

Lord Howe Island: UTC +10:30 / +11:00

  • Standard time: Lord Howe Standard Time (LHST)
  • Daylight time: Lord Howe Daylight Time (LHDT)
  • Example city: Lord Howe Island

Cocos (Keeling) Islands: UTC +06:30

  • Standard time: Cocos Islands Time (CCT)
  • Daylight time: None
  • Example city: Bantam

New Zealand, Chatham Islands: UTC +12:45 / +13:45

  • Standard time: Chatham Island Standard Time (CHAST)
  • Daylight time: Chatham Island Daylight Time (CHADT)
  • Example: Chatham Islands

Canada, Newfoundland: UTC -3:30 / -2:30

  • Standard time: Newfoundland Standard Time (NST)
  • Daylight time: Newfoundland Daylight Time (NDT).
  • Example: St. John's
  • NOTE: Only the island of Newfoundland and a few regions of Labrador follow NST/NDT. The rest follow Atlantic Time (AST) and Atlantic Daylight Time (ADT).

Sri Lanka: UTC +5:30

  • Standard time: India Standard Time (IST)
  • Daylight time: None
  • Example city: Colombo

Afghanistan: UTC +4:30

Time zones of the world
  • Standard time: Afghanistan Time (AFT)
  • Daylight time: None
  • Example city: Kabul

Iran: UTC +3:30 / +4:30

  • Standard time: Iran Standard Time (IRST)
  • Daylight time: Iran Daylight Time (IRDT).
  • Example city: Tehran

Time Zone 216

Myanmar: UTC +6:30

  • Standard time: Myanmar Time (MMT)
  • Daylight time: None
  • Example city: Naypyidaw

Nepal: UTC +5:45

  • Standard time: Nepal Time (NPT)
  • Daylight time: None
  • Example city: Kathmandu

French Polynesia, Marquesas Islands: UTC -9:30

Time Zone 214

  • Standard time: Marquesas Time (MART)
  • Daylight time: None
  • Example city: Taiohae

Historic Half-Hour Offsets

Time Zones United States

North Korea adopted Pyongyang Time (PYT) on August 15, 2015. The time zone had a UTC offset of +8:30. On May 5, 2018, North Korea returned to Korea Standard Time, which is UTC +9:00.

Time Zone 215

Venezuela changed its time zone by 30 minutes on May 1, 2016. The UTC-offset of Venezuelan Standard Time (VET) went from UTC -4:30 to UTC -4:00.