Australian Central Standard Time (ACST) is used in South Australia and Northern Territory.
The Northern Territory State does not use Daylight Saving Time (DST).Darwin Time
(Australia Northern Territory Time Zone) GMT+9.5
The Australian state of South Australia is in the Australian Central Standard Time Zone (ACST) .
Daylight Saving Time is in force during the summer months. Adelaide Time
Daylight saving runs in New South Wales, the Australian Capital Territory, Victoria, South Australia and Tasmania from the end of October through to the end of March.
Source: Australian Federal Government: www.australia.gov.au