Time Zones of Indonesia
|Basic time zone concepts|
|Section||Standard Time||Area Covered||Zone Name|
|West||UTC+7||Sumatera, Java, Western Borneo||Asia/Jakarta|
|Central||UTC+8||Sulawesi, Lesser Sunda Islands, Bali, Eastern Borneo||Asia/Ujung_Pandang|
|East||UTC+9||Irian Jaya, Maluku||Asia/Jayapura|
Indonesian time zones follow provincial boundaries. Western Borneo consists of the provinces of Kalimantan Barat and Kalimantan Tengah; Eastern Borneo is Kalimantan Selatan and Kalimantan Timur.
Source: This information was adapted from the tz database.
|Zone Name||Standard Time||Final Date|
|Asia/Jakarta||Local Mean Time||1867-08-10 00:00|
|Asia/Ujung_Pandang||Local Mean Time||1920-01-01 00:00|
|Asia/Jayapura||Local Mean Time||1932-11-01 00:00|
1988-01-01 00:00 Western Borneo switched from Asia/Ujung_Pandang to Asia/Jakarta zone.
The following names and abbreviations are standard in Indonesia.
|UTC+7||WIB||Waktu Indonesia Barat||Western Indonesia Standard Time|
|UTC+8||WITA||Waktu Indonesia Tengah||Central Indonesia Standard Time|
|UTC+9||WIT||Waktu Indonesia Timur||Eastern Indonesia Standard Time|
More formally, the names can be written "Waktu Indonesia Bagian Barat", etc. ("bagian" = "region").
The following names and abbreviations for Indonesian time zones come from the tz database. They were created by a contributor. Don't assume
that these names, or anything like them, have ever been used officially in Indonesia.
The western zone was called Jakarta Mean Time (JMT) from 1924 to 1932, and Java Time (JAVT) thereafter.
The central zone was called Macassar Mean Time (MMT) from 1932 to 1942, and Borneo Time (BORT) thereafter. (Note: the name of the city of Macassar was changed to Ujung Pandang around 1970.)
The eastern zone was called Jayapura Time (JAYT) from 1944 onward.
UTC+9, as used during World War II, was called JST.
UTC+9:30, as used in the eastern zone from 1944 to 1963, was called CST. There is no indication what this stood for.
Reference: Time Genie
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