South Australia operates on Australian Central Standard Time (ACST) during winter months, which is 9 hours and 30 minutes ahead of Coordinated Universal Time (UTC+9:30). During daylight saving time, observed from the first Sunday in October to the first Sunday in April, South Australia switches to Australian Central Daylight Time (ACDT), which is UTC+10:30.
All of South Australia follows the same timezone. Adelaide, the state capital, along with Mount Gambier and other regional areas all observe ACST/ACDT. South Australia is 30 minutes behind the eastern states (NSW, Victoria, Tasmania, ACT) year-round.
South Australia is the only Australian state to use a half-hour offset timezone. Adelaide is known as the "Festival State" and hosts major events including the Adelaide Festival and Adelaide Fringe. The state is also famous for its wine regions, including the Barossa Valley and McLaren Vale.