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Time in Indonesia:
  UTC+07:00 - Indonesia Western Standard Time
  UTC+08:00 - Indonesia Central Standard Time
  UTC+09:00 - Indonesia Eastern Standard Time
Neighboring countries:
  UTC+07:00 - Thailand, Vietnam
  UTC+08:00 - Brunei, Malaysia, Philippines, Singapore
  UTC+09:00 - East Timor, Palau
  UTC+09:30 - Central Australia
  UTC+10:00 - Papua New Guinea

The Indonesian archipelago geographically stretches across three time zones from UTC+07:00 in Aceh to UTC+09:00 in Western New Guinea. However, the Indonesian government only recognizes three time zones in its territory:

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.


Current usageEdit

In Indonesia, the keeping of standard time is divided into three time zones:

Indonesia Western Standard TimeEdit

Indonesia Western Standard Time (IWST) (WIB, Indonesian: Waktu Indonesia Barat) (UTC+07:00) is observed in:

Its IANA time zone database identifiers are "Asia/Jakarta" and "Asia/Pontianak"

Indonesia Central Standard TimeEdit

Indonesia Central Standard Time (ICST) (WITA, Indonesian: Waktu Indonesia Tengah) (UTC+08:00) is observed in:

Its IANA time zone database identifier is "Asia/Makassar"

Indonesia Eastern Standard TimeEdit

Indonesia Eastern Standard Time (IEST) (WIT, Indonesian: Waktu Indonesia Timur) (UTC+09:00) is observed in:

Its IANA time zone database identifier is "Asia/Jayapura"

It observed since 1 January 1988 (based on Keputusan Presiden No. 41 tahun 1987, Presidential Decision 41/1987).[1] Before it, Western and Central Kalimantan used ICST, and Bali used IWST from 1 January 1964 (based Keputusan Presiden No. 243 tahun 1963)[2]

Historical usageEdit

During the colonial era until early independence,[3] the time in Indonesia (Dutch East Indies) was regulated as follows:

Standardization Time Zone Indonesia 1932Edit

Daylight saving time was observed in Jakarta [5] from 1 May 1948 to 1 May 1950. It's UTC offset during daylight saving time is UTC+08:00.

It observed from 1 November 1932 to 22 March 1942, and from 23 September 1945 to 31 December 1963, except West Irian, ever observed it until 1944 and Jakarta, ever observed it all, except from 1 May 1948 to 1 May 1950.

From 23 March 1942 to 22 September 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[5] This makes the western parts of Indonesia on double daylight saving time and central parts of Indonesia on daylight saving time.

Single time zone proposalEdit

Date Event
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," [6]
2012-05-26 The Jakarta Post reported on 26 May 2012 that a single time zone using UTC+08:00 may start on 28 October 2012.[7]
2012-07-30 Reported on 30 July 2012 as still on the agenda[8]
2012-08-31 Jakarta Globe reported on 31 August 2012 that a single time zone is now put on hold.[9] 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) [10]
2013-02-09 Then the minister said that it's not abandoned, only without any definite date [11]

IANA time zone databaseEdit

The IANA time zone database contains four zones for Indonesia in the file

  • Asia/Jakarta
  • Asia/Pontianak
  • Asia/Makassar
  • Asia/Jayapura

See alsoEdit


  1. ^ Soeharto (26 November 1987). "Keputusan Presiden No. 41 Tahun 1987" (PDF). Keputusan Presiden No. 41 tahun 1987 - BAPPENAS. BAPPENAS. Archived from the original (PDF) on 20 April 2016. Retrieved 9 April 2016.
  2. ^, PT. VIVA MEDIA BARU -. "Indonesia Pernah Ubah 9 Kali Zona Waktu". Retrieved 2016-04-09.
  3. ^ "Garuda Indonesian Airways". 1963. Retrieved 4 March 2019.
  4. ^ a b "Time Zone in Jayapura, Papua, Indonesia". Retrieved 2016-04-09.
  5. ^ a b "Time Zone & Clock Changes in Jakarta, Jakarta Special Capital Region, Indonesia". Retrieved 30 March 2018.
  6. ^ "Archived copy". Archived from the original on 20 May 2012. Retrieved 27 May 2012.CS1 maint: Archived copy as title (link)
  7. ^ Post, The Jakarta. "Single time zone may begin in late October". Retrieved 30 March 2018.
  8. ^ "Indonesia to implement single time zone". Archived from the original on 31 July 2012. Retrieved 30 March 2018.
  9. ^ "Archived copy". Archived from the original on 18 October 2012. Retrieved 25 October 2012.CS1 maint: Archived copy as title (link)
  10. ^
  11. ^ Okezone. "Hatta : Penyatuan Zona Waktu Tidak Batal : Okezone Economy". Retrieved 30 March 2018.

External linksEdit