The Indonesian archipelago geographically stretches across four time zones from UTC+7 in Aceh to UTC+9 in Western Papua. However, the Indonesian government only recognizes three time zones in its territory:
- Indonesia Western Standard Time--seven hours in advance (UTC+7) of Greenwich Mean Time (GMT)
- Indonesia Central Standard Time-- eight hours ahead (UTC+8) of GMT; and
- Indonesia Eastern Standard 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 not currently observed in almost all of Indonesia due to its tropical location, resulting in those areas using their respective time zone all year long. The only unofficial exceptions are Muara Teweh and Maurainu, which unofficially use Indonesian Western Daylight Time.
Video Time in Indonesia
Current usage
In Indonesia, the keeping of standard time is divided into three time zones:
Indonesia Western Standard Time
Indonesia Western Standard Time (IWST) (WIB, Indonesian: Waktu Indonesia Barat) (UTC+07:00) is observed in:
- 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. Muara Teweh and Muara Inu unofficially uses Indonesian Western Daylight Time, which has the same time as Indonesia Central Standard Time.
IANA time zone database identifiers are "Asia/Jakarta" and "Asia/Pontianak"
Indonesia Central Standard Time
Indonesia Central Standard Time (ICST) (WITA, Indonesian: Waktu Indonesia Tengah) (UTC+08:00) is observed in:
- 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, Samarinda, and Tarakan.
IANA time zone database identifier is "Asia/Makassar"
Indonesia Eastern Standard Time
Indonesia Eastern Standard Time (IEST) (WIT, Indonesian: Waktu Indonesia Timur) (UTC+09:00) is observed in:
- Maluku Islands including major cities such as: Ambon City, Ternate City, and Tidore.
- All provinces in Western New Guinea including major cities such as: Jayapura, Biak, and Merauke.
IANA time zone database identifier is "Asia/Jayapura"
It observed since January 1, 1988 (based Keputusan Presiden No. 41 tahun 1987). Before it, Western and Central Kalimantan used ICST, and Bali used IWST from January 1, 1964 (based Keputusan Presiden No. 243 tahun 1963)
Maps Time in Indonesia
Historical usage
During the colonial era until early independence, the time in Indonesia (Dutch East Indies) was regulated as follows:
Standardization Time Zone Indonesia 1932
- Northern Sumatra Time (NST) (UTC+06:30), was observed in Aceh, Padang and Medan.
- Central and Southern Sumatra Time (CSST) (UTC+07:00), was observed in Bengkulu, Palembang and Lampung.
- Java, Bali, and Borneo Time (JBBT) (UTC+07:30), was observed in Java (Jawa), Bali, Madura and Kalimantan.
- Celebes Time (CBT) (UTC+08:00), was observed in Sulawesi and Lesser Sunda Islands.
- Moluccan Time (MCT) (UTC+08:30), was observed in Ternate, Namlea, Ambon, Sofifi and Banda.
- West Irian Time (WIT) (UTC+09:00) was observed in West Irian. It observed during November 1, 1932 to August 31, 1944.
- Dutch New Guinea Time (DGT) (UTC+09:30), was observed in West Irian during named Dutch New Guinea because Netherlands still hold West Irian. It observed from September 1, 1944 to December 31, 1963.
Daylight saving time was observed in Jakarta from May 1, 1948 to May 1, 1950. It's UTC offset during daylight saving time is UTC+08:00.
It observed from November 1, 1932 to March 22, 1942, and from September 23, 1945 to December 31, 1963, except West Irian, ever observed it until 1944 and Jakarta, ever observed it all, except from May 1, 1948 to May 1, 1950.
From March 23, 1942 to September 22, 1945, All region in Indonesia, except West Irian used Japan Standard Time (JST) (UTC+09:00) for the sake of the effectiveness of Japanese military operations in Indonesia This makes the western parts of Indonesia on double daylight saving time and central parts of Indonesia on daylight saving time.
Single time zone proposal
IANA time zone database
The IANA time zone database contains four zones for Indonesia in the file zone.tab.
- Asia/Jakarta
- Asia/Pontianak
- Asia/Makassar
- Asia/Jayapura
See also
- ASEAN Common Time
- Time in Malaysia
- Time in the Philippines
- Time in Singapore
- UTC+8
Notes
External links
- Indonesian Standard Time
- [1]
Source of the article : Wikipedia
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