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UTC+06:30
UTC+06:30
Time zone
UTC offset
UTC	UTC+6:30
Current time
	21:18, 19 December 2024 MMT [refresh]
Central meridian
Date-time group

Myanmar Standard Time ( Burmese: မြန်မာ စံတော်ချိန်, [mjəmà sàɰ̃dɔ̀dʑèiɰ̃]), formerly Burma Standard Time (BST), is the standard time in Myanmar, 6.5 hours ahead of UTC. Myanmar Standard Time (MMT) is calculated on the basis of 97°30′E longitude.^[1] MMT is used all year round, as Myanmar does not observe daylight saving time.^[2]^[3]

History

Pre-colonial period

Myanmar did not have a standard time before the British colonial period. Each region kept its own local mean time, according to the Burmese calendar rules: sunrise, noon, sunset and midnight.^{[note 1]} The day was divided into eight 3-hour segments called baho (ဗဟို), or sixty 24-minute segments called nayi (နာရီ). Although the calendar consists of time units down to the millisecond level, the popular usage never extended beyond baho and at most nayi measurements; a gong was struck every nayi while a drum (စည်) and a large bell (ခေါင်းလောင်း) were struck to mark every baho.^[5]

Type	Time	Burmese name	Description
Day	1 o'clock	နံနက် တစ်ချက်တီး	midway between sunrise and midday
	2 o'clock	နေ့ နှစ်ချက်တီး	noon (midday)
	3 o'clock	နေ့ သုံးချက်တီး	midway between noon and sunset
	4 o'clock	နေ့ လေးချက်တီး	sunset
Night	1 o'clock	ည တစ်ချက်တီး	midway between sunset and midnight
	2 o'clock	ည နှစ်ချက်တီး	midnight
	3 o'clock	ည သုံးချက်တီး	midway between midnight and sunrise
	4 o'clock	နံနက် လေးချက်တီး	sunrise

Colonial period

The use of a common time began in British Burma in the late 19th century. The first confirmed mention of Rangoon Mean Time (RMT) at GMT+6:24:40^{[note 2]} being in use was in 1892,^[6] a year before the country's first time ball observatory^{[note 3]} was opened in Rangoon (Yangon) on 1 October 1893.^[7]^[8] However, the use of RMT as the common time, at least in some sectors, most probably started earlier. (The country's first rail service, between Rangoon and Prome (Pyay), began on 2 May 1877,^[9] and the non-authoritative IANA time zone database says RMT was introduced in 1880.^[10]) On 1 July 1905,^[11]^[12] a new standard time called Burma Standard Time (BST) at GMT+6:30—set to the longitude 97° 30' E, and 5 minutes and 20 seconds ahead of RMT—was first adopted by the Railways and Telegraph administrations.^[11]^[13] Although the rest of the country came to adopt BST, RMT continued to be used in the city of Rangoon at least to 1927.^{[note 4]} By 1930, however, BST apparently had been adopted in Rangoon as well.^{[note 5]}

The standard time was changed to Japan Standard Time (JST) during the Japanese occupation of the country (1942–1945) in World War II.^[14]

After independence

The standard time was reverted to GMT+6:30 after the war.^[14] It has remained ever since, even after the country's independence in 1948. The only change has been its name in English; the official English name has been changed to Myanmar Standard Time^[1] presumably since 1989 when the country's name in English was changed from Burma to Myanmar.^[15] The country does not observe a daylight saving time.^[2]

Timeline of common times

Name	Period	Offset from UTC	Notes
Rangoon Mean Time	2 May 1877? – 30 June 1905	UTC+6:24:40	Standard time for British Burma from at least 1892 to 30 June 1905. Continued to be used in Rangoon (Yangon) at least to 1927^[16] perhaps until 1929.^[17]
Burma Standard Time	1 July 1905 – 30 April 1942	UTC+6:30:00	First adopted by Railways and Telegraph offices in 1905.^[11]^[13] The October 2021 IANA database says it was introduced in 1920^[14] but does not provide a source.
Japan Standard Time	1 May 1942 – 2 May 1945	UTC+09:00:00	Standard time during the Japanese occupation
Burma/Myanmar Standard Time	3 May 1945 – present	UTC+06:30:00

IANA time zone database

The IANA time zone database contains one time zone named Asia/Yangon^[18] for Myanmar^[14]

Country Code	Coordinates	Time Zone	Comments	UTC offset	UTC DST offset
MM	16°47′44″N 96°09′02″E / 16.79543°N 96.15051°E / 16.79543; 96.15051	Asia/Yangon	Asia/Rangoon	+06:30

Notes

^ (Clancy 1906: 57): The Burmese calendar recognizes two types of day: astronomical and civil. The mean Burmese astronomical day is from midnight to midnight, and represents 1/30th of a synodic month or 23 hours, 37 minutes and 28.08 seconds. The civil day comprises two halves, the first half beginning at sunrise and the second half at sunset.
^ The time offset of 6:24:40 was the time used by the official time signal station in Rangoon per (Kinns 2020: 545) and the Admiralty (Admiralty 1895: 27); it was confirmed by the US Naval Intelligence report (USNI 1928: 723).
The IANA database (https://www.iana.org/time-zones, version 2021e, released on 2021-10-21) gives 6:24:47, citing a secondary source (Reed and Low, The Indian Year Book, 1936–37, pp. 27–28); to be sure, the maintainers of the database do state that "this file is by no means authoritative." The 6:24:47 figure of (Reed and Low) may have been a typographical error from the 6:24:37 time given in (Indian Railway Board 1906: 7) which states that "... in Burma 6 1/2 hours ahead of Greenwich and 5 minutes 23 [sic] seconds earlier than Rangoon time." The Railway Board's 6:24:37 is likely false as the Admiralty records from 1898 to 1922 all say the official Rangoon time (per Kinns 2020: 545) was 6:24:40.
^ (Kinns 2020: 544): The British apparently were using a local pagoda (later came to be known as the Signal Pagoda) in Rangoon for signaling at least since 1855, three years after their annexation of Lower Burma; but "no supporting evidence of a Rangoon time signal has been found in notices prior to 1893."
^ An April 1927 dispatch by the US Naval Intelligence (USNI 1928: 723) says that the whole country, except Rangoon, used the standard time, GMT+6:30, while the city of Rangoon still used Rangoon Mean Time, which was 5 minutes 20 seconds behind Burma Standard Time (or GMT+6:24:40).
^ (Kinns 2020: 545): the UK Admiralty records show that the time ball at the Rangoon time signal station was dropped twice each day, once at GMT+17:30:00 for 00:00:00 BST (i.e. GMT+6:30:00) and also at GMT+17:35:20 for 00:00:00 RMT (i.e. GMT+6:24:40); it was only in 1930 that the time ball at Rangoon was dropped for the standard time (GMT+6:30:00).

References

^ ^a ^b MFF 2002: 1
^ ^a ^b USNAO 2013: 262
^ Myanmar
^ Kinns 2020: 544
^ Clancy 1906: 57
^ Kinns 2020: 544–545
^ Hydrographic 1895: 27
^ Kinns 2021: 445
^ Chailley-Bert 1894: 336
^ IANA TZ October 2021: Burma/Myanmar
^ ^a ^b ^c RE 1906: 346
^ USBS 1935: 3
^ ^a ^b USNO 1906: Volume IV, Appendix II, v
^ ^a ^b ^c ^d IANA October 2021: Burma/Myanmar
^ BBC News 2 December 2011
^ USNI 1928: 723
^ Kinns 2020: 545
^ Yangon

Bibliography

BBC News (2 December 2011). "Who, What, Why: Should it be Burma or Myanmar?". BBC News.
Chailley-Bert, Joseph (1894). The Colonisation of Indo-China. Translated by Arthur Baring Brabant. London: A. Constable & Company.
Clancy, J.C. (January 1906). T. Lewis; H.P. Hollis (eds.). "The Burmese Calendar: A Monthly Review of Astronomy". The Observatory. XXIX (366).
Hydrographic Office, Admiralty (1895). "Bay of Bengal Pilot". London. {{cite journal}}: Cite journal requires |journal= (help)
IANA Time Zone Database (2021-10-21). "Time Zone Database, 2021e". Retrieved 2022-01-01.
Kinns, Roger (2020). "Time Signals for Mariners in India, Burma and Ceylon" (PDF). Journal of Astronomical History and Heritage. 23 (3). Chiang Mai: National Astronomical Research Institute of Thailand: 523–552. Bibcode:2020JAHH...23..523K. doi:10.3724/SP.J.1440-2807.2020.03.05. S2CID 256563687.
Kinns, Roger (2021). "Time Signals for Mariners in Southeast Asia: Time Balls, Discs, Bells, Guns and Lights". In Wayne Orchiston; Mayank N. Vahia (eds.). Exploring the History of Southeast Asian Astronomy: A Review of Current Projects and Future Prospects and Possibilities. Cham, Switzerland: Springer. ISBN 978-3-030-62776-8.
The Railway Board of India (1906). Administration Report on the Railways in India for the Calendar Year 1905. Simla: Manager of Publications.
Union of Myanmar Ministry of Information (2002). Myanmar: Facts and Figures. Ministry of Information, Union of Myanmar.
United States National Bureau of Standards (1935). Standard Time Throughout the World. Washington: United States Department of Commerce.
United States Nautical Almanac Office (17 May 2013). The Nautical Almanac for the Year 2014. Government Printing Office. p. 262. ISBN 978-0-16-091756-1.
United States Naval Observatory (1906). Publications of the United States Naval Observatory. Vol. IV. Washington, DC: U.S. Government Printing Office.
United States Office of Naval Intelligence (1928). Port Directory of the Principal Foreign Ports. Washington: US Naval Department.