Darwin time zone history
Its standard time, UTC+9:30, is one of only 14 offsets among the 312 zones that are not a whole number of hours from UTC. On standard time, clocks at Darwin run 47 minutes ahead of local mean solar time, the largest gap of the 8 zones in Australia whose clocks run ahead of the sun.
UTC+9:30
Standard time is UTC+9:30 (ACST) all year under the current rules.
UTC+9:30 every day since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| February 1, 1895 | Local mean time (UTC+8:43:20) replaced | UTC+9 | ACST |
| May 1, 1899 | Standard time forward 30 minutes | UTC+9:30 | ACST |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| 1917 | January 1 | March 25 | 1 hour, ACST to ACDT |
| 1942 | January 1, September 27 | March 29 | 1 hour, ACST to ACDT |
| 1943 | October 3 | March 28 | 1 hour, ACST to ACDT |
| 1944 | not that year | March 26 | 1 hour |
Also on UTC+9:30
Clocks next door since 1970
- East Timor (720 km): usually 30 minutes behind; different on 8,903 days in 1976–2000.
- Makassar (Indonesia) (1,498 km): always 1 hour 30 minutes behind.
- Jayapura (Indonesia) (1,549 km): always 30 minutes behind.
- Port Moresby (Papua New Guinea) (1,813 km): always 30 minutes ahead.
- Lindeman (2,121 km): usually 30 minutes ahead; different on 756 days in 1971, 1972 and 1989–1994.
How it compares
The Darwin zone has kept UTC+9:30 since 1899, with no clock changes since 1970.