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Mainland Australia has three official time zones. The full names of the time zones are usually shortened by dropping the Australian. Most Australian external territories are in different time zones. Many parts of Australia have daylight saving time.
| Official Australian time zones | |||
| Full name of time zone | Australian Western Standard Time (WST) | Australian Central Standard Time (ACST) | Australian Eastern Standard Time (AEST) |
| Short name of time zone | Western Standard Time (WST) | Central Standard Time (CST) | Eastern Standard Time (EST) |
| Hours and minutes ahead of GMT | + 8:00 | + 9:30 | +10:00 |
| State or territory | Western Australia | Northern Territory South Australia | Queensland New South Wales Australian Capital Territory Victoria Tasmania |
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