Time in Indonesia

Last updated
Time in Indonesia
TimezonesID.svg
Map of time zones of Indonesia
Current time across Indonesia
Western Indonesia Time
(UTC+7)
6:42 am, 4 June 2023 [refresh]
Central Indonesia Time
(UTC+8)
7:42 am, 4 June 2023 [refresh]
Eastern Indonesia Time
(UTC+9)
8:42 am, 4 June 2023 [refresh]

The Indonesian Archipelago geographically stretches across four time zones from UTC+06:00 in Aceh to UTC+09:00 in Papua. However, the Indonesian government recognises only three time zones in its territory, namely:

Contents

The boundary between the Western and Central time zones was established as a line running north between Java and Bali through the provincial boundaries of West and Central Kalimantan. The border between the Central and Eastern time zones runs north from the eastern tip of Indonesian Timor to the eastern tip of Sulawesi.

Daylight saving time (DST) is no longer observed anywhere in Indonesia.

Current usage

Indonesia is divided into three time zones:

time
zone
name
name in
Indonesian
current time
and
abbreviation
UTC
offset
WIB
offset
area coveredpopulation [1]
Western Indonesia TimeWaktu Indonesia Barat06:42, 4 June 2023 WIB [refresh] UTC+07:00 WIB+/-0h Sumatra (consists of Aceh, Bengkulu, Jambi, Lampung, North Sumatra, Riau, South Sumatra, and West Sumatra), Riau Islands, Bangka Belitung Islands, Java (consists of Banten, Jakarta, West Java, Central Java, Special Region of Yogyakarta, and East Java), West Kalimantan and Central Kalimantan 218,212,832
Central Indonesia TimeWaktu Indonesia Tengah07:42, 4 June 2023 WITA [refresh] UTC+08:00 WIB+1h South Kalimantan, East Kalimantan, North Kalimantan, Nusantara, Sulawesi (consists of North Sulawesi, Gorontalo Central Sulawesi, West Sulawesi, South Sulawesi and Southeast Sulawesi), Bali, West Nusa Tenggara and East Nusa Tenggara 43,401,450
Eastern Indonesia TimeWaktu Indonesia Timur08:42, 4 June 2023 WIT [refresh] UTC+09:00 WIB+2h Maluku, North Maluku, Central Papua, Highland Papua, South Papua, Southwest Papua, West Papua and Papua 8,569,635

These time zones have existed in their present form since 1 January 1988. [2]

The history of time divisions

Early timekeeping

The first regulation of time was implemented in 1908 at the request of the Staatsspoorwegen Dutch railway company in Java during the time of the Dutch East Indies. The time in Central Java was set at 12 minutes later than the capital, Batavia, which used GMT +7 hours.. This regulation, which came into effect on 1 May 1908, applied only to Java and Madura. Time in the rest of the archipelago remained unregulated. [3] [4]

Ten years later, on 22 February 1918, time in Padang, Sumatra was set at 39 minutes ahead of Central Java, while time in Palembang was set at 8 hours and 20 minutes ahead of Greenwich Mean Time. Then, on 1 January 1924, times for various locations were set as follows: [3] [4]

LocationTime
Central Java GMT +7:20
Tapanoeli Residency Central Java -45 minutes
Padang Central Java -7 minutes
Bali and Lombok Central Java +22 minutes
Makassar Central Java +38 minutes

Standardised Time Zones

In 1932, the Dutch colonial government through a Governments Besluit dated 27 July published in Staatsblad No. 412, divided the entire colony into six time zones separated by 30 minutes as follows:

time zonein Dutch UTC
offset
locations
Northern Sumatra TimeNord-Sumatra tijd UTC+06:30 Aceh, Padang, and Medan.
Southern Sumatra TimeZuid-Sumatra tijd UTC+07:00 Bengkulu, Palembang, and Lampung.
Java TimeJava tijd UTC+07:30 Java, Bali, Madura and Kalimantan.
Celebes TimeCelebes tijd UTC+08:00 Sulawesi and Lesser Sunda Islands.
Moluccan TimeMolukken tijd UTC+08:30 Ternate, Namlea, Ambon, and Banda.
New GuineaNieuw-Guinea tijd UTC+09:00 West Irian. Observed from1 November 1932 to 31 August 1944. [5]
Dutch New Guinea TimeNederlandse Nieuw-Guinea tijd UTC+09:30 West Irian, then still named Dutch New Guinea was still controlled by the Dutch. Observed from 1 September 1944 to 31 December 1963. [6]

During the Japanese occupation of the Dutch East Indies, from 27 March 1942 to 24 September 1945, both western and central parts of Indonesia used Japan Standard Time (JST) (UTC+09:00) for the sake of the effectiveness of Japanese military operations in Indonesia. [7] [4]

Timezones post-independence

The time zones in effect from 1932-1942 and 1950-1963 Indonesia 6 time zones.png
The time zones in effect from 1932-1942 and 1950-1963

When the Dutch returned in 1945, they reimposed three time zones (GMT +6, +7 and +8), with a separate GMT +9 time zone for Dutch New Guinea. Following Dutch recognition of Indonesian sovereignty, a presidential regulation came into effect on 1 May 1950 once again dividing the country into six time zones separated by half an hour. Then, on 1 January 1964, another presidential decree came into effect, imposing the current system of three time zones. The final change came on 1 January 1988 when Bali was moved out of the West Indonesia time zone in to the Central Indonesia timezone, and West and Central Kalimantan were transferred from Central to West Indonesian Time. [2] [3]

Proposal for a single time zone

On 12 March 2012, Coordinating Minister for the Economy Hatta Rajasa said: "According to research, with a single time zone the country could cut costs by trillions of rupiah." [8] Two months later, the Jakarta Post reported that a single time zone using UTC+08:00 may start on 28 October 2012. [9] However in August, the Jakarta Globe reported that the plan was now on hold. [10] 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. In January 2013, a deputy minister said the idea had been abandoned after missed two target dates: 17 August (Independence day) and 28 October 2012 (Youth Pledge day). [11] Later that year, Hatta claimed that the plan had not been abandoned, although there was no deadline for implementation. [12]

IANA time zone database

The IANA time zone database contains four zones for Indonesia in the file zone.tab. [13]

See also

Notes

  1. Statistics Indonesia 2020.
  2. 1 2 BAPPENAS 1987, p. 2.
  3. 1 2 3 Hendaru Tri Hanggoro 2021.
  4. 1 2 3 vivi.co.id 2023.
  5. tiamanddate.com nd.
  6. "Time Zone in Jayapura, Papua, Indonesia". timeanddate.com. Retrieved 9 April 2016.
  7. Post et al. 2023, pp. 50, 614.
  8. Jakarta Post 2012a.
  9. Jakarta Post 2012b.
  10. Tito Summa Siahaan 2012.
  11. Iwan Kurniawan & Raden Jihad Akbar 2013.
  12. Okzone 2013.
  13. IANA 2023.

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References