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Time in Vietnam

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ReunifiedVietnam followsIndochina Time (ICT), which is seven hours ahead ofUTC, ICT is used all year round as Vietnam does not observedaylight saving time. Vietnam shares the same time zone withThailand,Cambodia,Christmas Island,Laos, and WesternIndonesia.

Vietnam referencedISO 8601 under in 1998 and then created its own standard TCVN 6398-1:1998.^[1]

History

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After Phủ Liễn Observatory was built, French Indochina announced all states (consisting of north-VietnameseTonkin, central-VietnameseAnnam, south-VietnameseCochinchina, as well asCambodia,Laos and ChineseGuangzhouwan) were part of 104°17′17″E longitude east of Paris meridian 2°20′14″E, or 106°37′30″E fromGreenwich Mean Time from 00:00, 1 July 1906 onward.
In 1911,Metropolitan France adoptedUTC+00:00 (thesolar time ofGreenwich) as its official time, and used it until 1940 (withUTC+01:00 used during the summers from 1916 to 1940), forcing French Indochina observed UTC+07:00 from 00:00, 1 May 1911.
Following change in time zone ofVichy authorities, French Indochina was integrated to UTC+08:00 skipping 60 minutes at 23:00, 31 December 1942.
TheEmpire of Japan occupied Vichy French Indochina fully. Indochinese regions thereafter followed Tokyo time zone (UTC+09:00), skipping 60 minutes at 23:00, 14 March 1945.
ByAugust General Uprising, the Fall ofEmpire of Vietnam and theProclamation of Independence of the Democratic Republic of Vietnam, Provisional Uniform Government of theDemocratic Republic of Vietnam took control, announcing UTC+07:00 as official time zone on 2 September 1945. Whilst, the then under-attack regions of Vietnam, Laos and Cambodia adopted UTC+08:00 and non-attacked regions (at the time and even after the1954 Geneva Conference) adopted UTC+07:00 fromApril 1, 1947: Laos (part of Indochina) from 15 April 1954, Hanoi from October 1954, Haiphong from May 1955.
Under control ofState of Vietnam, South Vietnam adopted UTC+07:00 from 00:00, 1 July 1955.
South Vietnam time zone was changed to UTC+08:00 from 23:00, 31 December 1959, passing 60 minutes.
North Vietnam confirmed official UTC+07:00 from 1 January 1968.
Following theFall of Saigon in April–May 1975, reunified Vietnam then observes UTC+07:00 withSaigon (and other southern parts) delaying 60 minutes on 13 June 1975.

Time inFrench Indochina

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Period in use	Time offset from GMT	Notes
Prior to 1 July 1906	UTC+07:06:40	Local mean time
1 July 1906 – 30 April 1911	UTC+07:06:30	106°37'30"E French Time
1 May 1911 – 30 December 1942	UTC+07:00	Standard Time Zone
31 December 1942 – 13 March 1945	UTC+08:00	Standard Time Zone
14 March 1945 – 1 September 1945	UTC+09:00	Tokyo Standard Time
2 September 1945 – Activation ofGeneva Accords	UTC+07:00	Standard Time Zone

Time inNorth Vietnam

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Period in use	Time offset from GMT	Notes
2 September 1945 – 31 March 1947	UTC+07:00	Hanoi Time Zone
1 April 1947 – Activation ofGeneva Accords After the activation	No Standard Time UTC+07:00 for zone under peace UTC+08:00 for zone under attacking
1 January 1968 – 12 June 1975	UTC+07:00	Hanoi Time Zone

Time inSouth Vietnam

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Period in use	Time offset from GMT	Notes
Activation ofGeneva Accords – 30 June 1955	UTC+08:00	Saigon Standard Time
1 July 1955 – 31 December 1959	UTC+07:00	Saigon Standard Time
1 January 1960 – 12 June 1975	UTC+08:00	Saigon Standard Time

Time in Reunified Vietnam

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Period in use	Time offset from GMT	Notes
13 June 1975 – now	UTC+07:00	Standard Time Zone

IANA time zone database

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TheIANA time zone database contains one zone for Reunified Vietnam in the filezone.tab, named Asia/Ho_Chi_Minh. For timestamps in North Vietnam back to 1970 (database cutoff), the database uses the Asia/Bangkok entry.


c.c.	Coordinates	Timezone name	Comments	UTC offset	Notes
VN	+1045+10640	Asia/Ho_Chi_Minh	south Vietnam	+07:00
VN		Asia/Saigon		+07:00	linked back to Asia/Ho_Chi_Minh
TH	+1345+10031	Asia/Bangkok	north Vietnam	+07:00

References

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^"TCVN-6398-1-1998-Dai-luong-va-don-vi-Khong-gian-va-thoi-gian – bản lưu trữ".Thuvienphapluat.vn. Retrieved24 March 2019.

Bibliography

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Trần Tiến Bình (2005),Lịch Việt Nam thế kỷ XX-XXI (1901–2100), Nhà xuất bản Văn hoá Thông tin, Hanoi.

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