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((Short description|Reunified Vietnam follows Indochina Time (ICT)))
((Use dmy dates|date=December 2020))((Refimprove|date=March 2019))
Reunified [[Vietnam]] follows [[UTC+07:00|Indochina Time]] (ICT), which is seven hours ahead of [[Coordinated Universal Time|UTC]], ICT is used all year round as Vietnam does not observe [[daylight saving time]]. Vietnam shares the same time zone with [[Thailand]], [[Cambodia]], [[Christmas Island]], [[Laos]], and Western [[Indonesia]].

Vietnam referenced [[ISO 8601]] under in 1998 and then created its own standard TCVN 6398-1:1998.<ref>((cite web|url=https://thuvienphapluat.vn/archive/TCVN-6398-1-1998-Dai-luong-va-don-vi-Khong-gian-va-thoi-gian-vb907037.aspx|title=TCVN-6398-1-1998-Dai-luong-va-don-vi-Khong-gian-va-thoi-gian – bản lưu trữ|website=Thuvienphapluat.vn|access-date=24 March 2019))</ref>

== History ==
((Unreferenced section|date=October 2014))
* After Phủ Liễn Observatory was built, French Indochina announced all states (consisting of north-Vietnamese [[Tonkin]], central-Vietnamese [[Annam (French protectorate)|Annam]], south-Vietnamese [[Cochinchina]], as well as [[Cambodia]], [[Laos]] and Chinese [[Guangzhouwan]]) were part of 104°17′17″E longitude east of Paris meridian 2°20′14″E, or 106°37′30″E from [[Greenwich Mean Time]] from 00:00, 1 July 1906 onward.
* In 1911, [[Metropolitan France]] adopted [[UTC±00:00]] (the [[solar time]] of [[Greenwich]]) as its official time, and used it until 1940 (with [[UTC+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 of [[Vichy France|Vichy authorities]], French Indochina was integrated to UTC+08:00 skipping 60 minutes at 23:00, 31 December 1942.
* The [[Empire of Japan]] [[Japanese invasion of French Indochina|occupied Vichy French Indochina]] fully. Indochinese regions thereafter followed Tokyo time zone (UTC+09:00), skipping 60 minutes at 23:00, 14 March 1945.
* By [[August Revolution|August General Uprising]], the Fall of [[Empire of Vietnam]] and the [[Proclamation of Independence of the Democratic Republic of Vietnam]], Provisional Uniform Government of the [[Democratic 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 the [[1954 Geneva Conference]]) adopted UTC+07:00 from [[April 1]], 1947: Laos (part of Indochina) from 15 April 1954, Hanoi from October 1954, Haiphong from May 1955.
* Under control of [[State 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 the [[Fall of Saigon]] in April–May 1975, reunified Vietnam then observes UTC+07:00 with [[Saigon]] (and other southern parts) delaying 60 minutes on 13 June 1975.

=== Time in [[French Indochina]] ===
{| class="wikitable"
! Period in use
! Time offset from GMT
! Notes
|-
| Prior to 1 July 1906
| [[UTC+07:00|UTC+07:06:40]]
| [[Local mean time]]
|-
| 1 July 1906 – 30 April 1911
| [[UTC+07:00|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]]
| '''[[Japan Standard Time|Tokyo Standard Time]]'''
|-
| 2 September 1945 – Activation of [[Geneva Accords (1954)|Geneva Accords]]
| [[UTC+07:00]]
| '''Standard Time Zone'''
|}

=== Time in [[North Vietnam]] ===
{| class="wikitable"
! Period in use
! Time offset from GMT
! Notes
|-
| 2 September 1945 – 31 March 1947
| [[UTC+07:00]]
| '''Hanoi Time Zone'''
|-
| 1 April 1947 – Activation of [[Geneva Accords (1954)|Geneva Accords]]<br> After the activation
|colspan=2| '''No Standard Time'''<br> [[UTC+07:00]] for zone under peace<br> [[UTC+08:00]] for zone under attacking
|-
| 1 January 1968 – 12 June 1975
| [[UTC+07:00]]
| '''Hanoi Time Zone'''
|}

=== Time in [[South Vietnam]] ===
{| class="wikitable"
! Period in use
! Time offset from GMT
! Notes
|-
| Activation of [[Geneva Accords (1954)|Geneva 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 ===
{| class="wikitable"
! Period in use
! Time offset from GMT
! Notes
|-
| 13 June 1975 – now
| [[UTC+07:00]]
| '''Standard Time Zone'''
|}

== See also ==
* [[ASEAN Common Time]] (ACT)
* [[Indochina Time]] (ICT)
* [[Time in Cambodia]]
* [[Time in Laos]]
* [[Time in Thailand]]
* [[UTC+08:00]]
* [[UTC+09:00]]

== References ==
((Reflist))

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

((Vietnam topics|Time in))
((Asia topic|Time in))

[[Category:Time in Vietnam| ]]
[[Category:Time in Southeast Asia|Vietnam]]

Pages transcluded onto the current version of this page (help):

Economy of Vietnam (edit)
Geography of Vietnam (edit)
History of Vietnam (edit)
Index of Vietnam-related articles (edit)
Outline of Vietnam (edit)
Politics of Vietnam (edit)
Time in Vietnam (edit)
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