Perth time zone history
Standard time has stayed at UTC+8 since 1895, the longest run of the 8 zones on UTC+8 standard time with no change of standard time since 1970. Daylight saving time was used in 10 years since 1970, last in 2009; under the current rules the clocks no longer change. Perth left local mean time (UTC+7:43:24) in 1895, the second-earliest switch of the 11 zones on UTC+8 standard time with local mean time in the record.
UTC+8
Standard time is UTC+8 (AWST) all year under the current rules.
Summer time in 10 of 57 years since 1970
Before 1970
Standard time changes
| Date | Change | New standard time | Clock label |
|---|---|---|---|
| Before 1970 | |||
| December 1, 1895 | Local mean time (UTC+7:43:24) replaced | UTC+8 | AWST |
Daylight saving periods
| Years | Clocks go forward | Clocks go back | Shift and labels |
|---|---|---|---|
| Before 1970 | |||
| 1917 | January 1 | March 25 | 1 hour, AWST to AWDT |
| 1942 | January 1, September 27 | March 29 | 1 hour, AWST to AWDT |
| 1943 | not that year | March 28 | 1 hour, AWST to AWDT |
| Since 1970 | |||
| 1974 | October 27 | not that year | 1 hour, AWST to AWDT |
| 1975 | not that year | March 2 | 1 hour, AWST to AWDT |
| 1983 | October 30 | not that year | 1 hour, AWST to AWDT |
| 1984 | not that year | March 4 | 1 hour, AWST to AWDT |
| 1991 | November 17 | not that year | 1 hour, AWST to AWDT |
| 1992 | not that year | March 1 | 1 hour, AWST to AWDT |
| 2006 | December 3 | not that year | 1 hour, AWST to AWDT |
| 2007–2008 | last Sunday in October, 02:00 | last Sunday in March, 03:00 | 1 hour, AWST to AWDT |
| 2009 | not that year | March 29 | 1 hour |
Also on UTC+8
Makassar (Indonesia), Malaysia, Casey Station (Antarctica), Singapore, Philippines, Macau, Hong Kong, Taiwan, Shanghai (China) and Ulaanbaatar (Mongolia) (nearest first; 1 more on the list of offsets).
Clocks next door since 1970
- Eucla (1,229 km): always 45 minutes ahead.
- Adelaide (2,130 km): usually 1 hour 30 minutes ahead; different on 7,755 days in 1971–2026.
- Broken Hill (2,410 km): usually 1 hour 30 minutes ahead; different on 7,713 days in 1971–2026.
- Darwin (2,653 km): usually 1 hour 30 minutes ahead; different on 777 days in 10 different years between 1974 and 2009.
- Melbourne (2,723 km): usually 2 hours ahead; different on 7,790 days in 1971–2026.
How it compares
Clocks were first moved for daylight saving in 1916, the earliest start of the 10 zones on UTC+8 standard time that ever used daylight saving time.
On standard time, clocks in Perth run 17 minutes ahead of local mean solar time.