You can trade the Australian Dollar 24 hours a day, five days a week – from 10pm (UTC) on Sunday evening to 10pm (UTC) on Friday night.
The best time of day to trade the Aussie Dollar will depend on which pairing you decide to focus on. As a rule, each pair will see the most movement when its sessions overlap. For example, the AUD/GBP pair would be more highly traded when both the Tokyo and London forex sessions overlap.

Learn more about forex trading hours.