Vietnam time zone history
On standard time, clocks in Ho Chi Minh City run 7 minutes behind local mean solar time. Local mean time, UTC+7:06:30, ended in 1906.
UTC+7
Standard time is UTC+7 all year under the current rules.
Once a new standard time since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| July 1, 1906 | Local mean time (UTC+7:06:30) replaced | UTC+7:06:30 | PLMT |
| May 1, 1911 | Standard time back 6 minutes | UTC+7 | numeric only |
| December 31, 1942 | Standard time forward 1 hour | UTC+8 | numeric only |
| March 14, 1945 | Standard time forward 1 hour | UTC+9 | numeric only |
| September 2, 1945 | Standard time back 2 hours | UTC+7 | numeric only |
| April 1, 1947 | Standard time forward 1 hour | UTC+8 | numeric only |
| July 1, 1955 | Standard time back 1 hour | UTC+7 | numeric only |
| December 31, 1959 | Standard time forward 1 hour | UTC+8 | numeric only |
| Since 1970 | |||
| June 13, 1975 | Standard time back 1 hour | UTC+7 | numeric only |
Also on UTC+7
Thailand, Pontianak (Indonesia), Jakarta (Indonesia), Hovd (Mongolia), Novokuznetsk (Russia), Barnaul (Russia), Krasnoyarsk (Russia), Novosibirsk (Russia), Tomsk (Russia) and Davis Station (Antarctica).
Clocks next door since 1970
- Thailand (747 km): same time except 1,989 days in 1970–1975.
- Singapore (1,098 km): usually 1 hour ahead; different on 4,383 days in 1970–1981.
- Malaysia (1,100 km): usually 1 hour ahead; different on 1,989 days in 1970–1975.
- Pontianak (Indonesia) (1,235 km): same time except 4,585 days in 1975–1987.
- Myanmar (1,317 km): usually 30 minutes behind; different on 1,989 days in 1970–1975.