Singapore time zone history
On standard time, clocks at Singapore run 1 hour 5 minutes ahead of local mean solar time, the largest gap of the 9 zones on UTC+8 standard time whose clocks run ahead of the sun. Since 1970 it has also used UTC+7:30, an offset that is not a whole number of hours. The record holds 6 different UTC offsets, the most of the 12 zones on UTC+8 standard time.
UTC+8
Standard time is UTC+8 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 | |||
| January 1, 1901 | Local mean time (UTC+6:55:25) replaced | UTC+6:55:25 | SMT |
| June 1, 1905 | Standard time forward 5 minutes | UTC+7 | numeric only |
| January 1, 1936 | Summer offset kept as standard time; clocks did not move | UTC+7:20 | numeric only |
| September 1, 1941 | Standard time forward 10 minutes | UTC+7:30 | numeric only |
| February 16, 1942 | Standard time forward 1 hour 30 minutes | UTC+9 | numeric only |
| September 12, 1945 | Standard time back 1 hour 30 minutes | UTC+7:30 | numeric only |
| Since 1970 | |||
| December 31, 1981 | Standard time forward 30 minutes | UTC+8 | numeric only |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1933 | January 1 | not that year | 20 minutes |
Also on UTC+8
Malaysia, Makassar (Indonesia), Philippines, Macau, Hong Kong, Taiwan, Shanghai (China), Perth (Australia), Ulaanbaatar (Mongolia) and Irkutsk (Russia) (nearest first; 1 more on the list of offsets).
Clocks next door since 1970
- Pontianak (Indonesia) (627 km): usually 1 hour behind; different on 6,574 days in 1970–1987.
- Malaysia (721 km): same time except 4,383 days in 1970–1981.
- Jakarta (Indonesia) (891 km): usually 1 hour behind; different on 4,383 days in 1970–1981.
- Vietnam (1,098 km): usually 1 hour behind; different on 4,383 days in 1970–1981.
- Thailand (1,434 km): usually 1 hour behind; different on 4,383 days in 1970–1981.