Time in Indonesia
The Indonesian archipelago geographically stretches across four time zones from UTC+6 in Aceh to UTC+9 in Western Papua. However, The Indonesian government only recognizes three time zones in its territory: Western Indonesian Time—seven hours in advance (UTC+7) of Greenwich Mean Time (GMT), Central Indonesian Time— eight hours ahead (UTC+8) of GMT, and Eastern Indonesian Time—nine hours ahead (UTC+9) of GMT. The boundary between the western and central time zones established is a line running north between Java and Bali through the center of Kalimantan. The border between central and eastern time zones runs north from the eastern tip of Timor to the eastern tip of Sulawesi.
Daylight saving time is never observed in Indonesia due to its tropical location, resulting in each area using their respective time zone all year long.
Western Indonesian Time
- All provinces in the island of Sumatra and its surrounding islands including major cities such as: Banda Aceh, Medan, Padang, Pekanbaru, Palembang, Jambi, Batam and Bandar Lampung.
- All provinces in the island of Java including major cities such as: Bandung, Surabaya, Jakarta, Semarang and Yogyakarta.
- Two provinces in Kalimantan island: West Kalimantan and Central Kalimantan. Including major cities such as: Pontianak, Palangkaraya, and Sampit.
Central Indonesian Time
- All provinces in the island of Sulawesi including major cities such as: Makassar, Manado, Palu and Gorontalo.
- All provinces in the Lesser Sunda Islands including major cities such as: Denpasar, Mataram, and Kupang.
- Three provinces in Kalimantan island: North Kalimantan, East Kalimantan and South Kalimantan, including major cities such as: Balikpapan, Banjarmasin, and Tarakan.
IANA time zone database identifier is "Asia/Makassar"
Eastern Indonesian Time
- Maluku Islands including major cities such as: Ambon City, Ternate City, and Tidore.
- All provinces in West Papua including major cities such as: Jayapura, Biak, and Merauke.
- All provinces in Papua including all major islands in the province.
IANA time zone database identifier is "Asia/Jayapura"
- Northern Sumatra Time (UTC+06:30), was observed in Aceh, Padang and Medan.
- Sumatra Time (UTC+07:00), was observed in Bengkulu, Palembang and Lampung.
- Java Time (UTC+07:30), was observed in Java, Bali, Madura and Kalimantan.
- Celebes Time (UTC+08:00), was observed in Sulawesi and Lesser Sunda Islands.
- Moluccan Time (UTC+08:30), was observed in Ternate, Namlea, Ambon and Banda.
- Dutch New Guinea Time (UTC+09:00), was observed in Dutch New Guinea.
Single time zone proposal
|2012-03-12||Coordinating Minister for the Economy Hatta Rajasa is reported to have said: “According to research, with a single time zone the country could cut costs by trillions of rupiah,” |
|2012-05-26||The Jakarta Post reported on 26 May 2012 that a single time zone using UTC+08:00 may start on Oct 28, 2012.|
|2012-07-30||Reported on 30 July 2012 as still on the agenda|
|2012-08-31||Jakarta Globe reported on 31 August 2012 that a single time zone is now put on hold. The Indonesian Economic Development Committee (KP3EI) cited that they will need at least 3 months to communicate and plan for the change. Hence this could happen in 2013.|
|2013-01-30||A deputy minister said the idea has been abandoned after missed two target dates: 17 August (Independence day) and 28 October 2012 (Youth Pledge day) |
|2013-02-09||Then the minister said that it's not abandoned, only without any definite date |
IANA time zone database
- Indonesia to implement single time zone