Half Hour and 45-Minute Time Zones
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.
Green and yellow areas have offsets of 30 or 45 minutes.
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
- 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
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
- Standard time: Marquesas Time (MART)
- Daylight time: None
- Example city: Taiohae
Historic Half-Hour Offsets
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.
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.