Standard Time is 8 hours ahead of Greenwich Mean Time (GMT+8). Daylight Savings Time is 9 hours ahead of Greenwich Mean Time (GMT+9).
Based on the mean solar time of 120°E. Covering Western Australia and using time 8 hours ahead of GMT. Perth’s longitude is 115° 31’ East
Daylight Saving (Summer) Time was not observed in Western Australia prior to 2006. Western Australia voted to end the 3 year trial of Daylight Savings Time and no longer applies. See Daylight Savings Time .
The International Dialling Code for Western Australia is +618.
Government of Western Australia website : www.wa.gov.au