ACDT is a Daylight Saving Time zone and is not currently in effect. The region is now on Standard Time (ACST).
Please see the correct page here: Current Time in ACST.
Current Time in ACDT (Australian Central Daylight Time)
About ACDT
Observed in South Australia and Broken Hill, New South Wales, during daylight saving period. It is one hour ahead of Australian Central Standard Time (ACST). Typically used from the first Sunday in October to the first Sunday in April.
UTC Offset: +10:30
Current time shown is based on the representative IANA zone: Australia/Adelaide
Australian Central Daylight Time (ACDT)
Australian Central Daylight Time (ACDT) is the daylight saving time observed in the central part of South Australia and the town of Broken Hill in New South Wales, Australia. It is 10 hours and 30 minutes ahead of Coordinated Universal Time (UTC+10:30). ACDT is used during the summer months, while the standard time, Australian Central Standard Time (ACST, UTC+9:30), applies in winter.
What is Australian Central Daylight Time?
ACDT stands for Australian Central Daylight Time. The abbreviation reflects its purpose: it is the daylight saving variant of Australian Central Standard Time (ACST). During daylight saving, clocks are advanced by one hour, shifting from UTC+9:30 to UTC+10:30. This adjustment provides longer evening daylight in the warmer months.
Regions and Cities Observing ACDT
ACDT is observed in the following IANA time zones: Australia/Adelaide, Australia/Broken_Hill, Australia/South, and Australia/Yancowinna. These cover the state of South Australia (including its capital Adelaide) and the town of Broken Hill in far western New South Wales. Key cities include Adelaide, Mount Gambier, Port Augusta, Port Pirie, and Whyalla in South Australia, as well as Broken Hill in New South Wales.
Daylight Saving Schedule
Daylight saving in the ACDT zone typically begins on the first Sunday in October, when clocks are set forward from ACST (UTC+9:30) to ACDT (UTC+10:30). It ends on the first Sunday in April, when clocks are set back to ACST. This schedule is consistent across South Australia and Broken Hill, though New South Wales as a whole does not observe daylight saving except for Broken Hill, which follows South Australian time.
Comparison with Neighbouring Zones
Australia has three main time zones: Australian Western Standard Time (AWST, UTC+8), Australian Central Standard Time (ACST, UTC+9:30), and Australian Eastern Standard Time (AEST, UTC+10). During daylight saving, the eastern zone shifts to Australian Eastern Daylight Time (AEDT, UTC+11), while the central zone shifts to ACDT (UTC+10:30). Western Australia does not observe daylight saving. Thus, during daylight saving, ACDT is 30 minutes behind AEDT and 1 hour 30 minutes ahead of ACST (though ACST is not observed during this period in the ACDT zone). Compared to other zones globally, ACDT shares its offset with Lord Howe Island (UTC+10:30) during its standard time, but Lord Howe Island uses a different daylight saving schedule (UTC+11).
Practical Business Hours Guidance
When scheduling calls or meetings with ACDT locations, note that Adelaide is 30 minutes behind Sydney and Melbourne (AEDT) during Australian summer. For example, 9:00 AM in Adelaide is 9:30 AM in Sydney. During the northern hemisphere summer (when ACDT is not in effect), Adelaide uses ACST (UTC+9:30), which is 30 minutes behind AEST (UTC+10). For international coordination, be aware that ACDT is 14.5 hours ahead of New York (EST) during US winter, and 13.5 hours ahead during US summer (EDT). For London, ACDT is 10.5 hours ahead during UK winter (GMT) and 9.5 hours ahead during UK summer (BST). Always verify the current daylight saving status, as dates may vary.
Frequently Asked Questions
What is the UTC offset of ACDT?
ACDT is UTC+10:30, which is 10 hours and 30 minutes ahead of Coordinated Universal Time.
Which Australian states use ACDT?
South Australia uses ACDT during daylight saving. Additionally, the town of Broken Hill in New South Wales follows South Australian time, so it also observes ACDT.
When does daylight saving start and end for ACDT?
Daylight saving begins on the first Sunday in October (clocks forward) and ends on the first Sunday in April (clocks back).
Is ACDT the same as AEDT?
No. ACDT is UTC+10:30, while AEDT (Australian Eastern Daylight Time) is UTC+11. ACDT is 30 minutes behind AEDT.
Does Broken Hill observe ACDT?
Yes, Broken Hill in New South Wales observes ACDT because it follows South Australian time, including daylight saving.
What is the standard time version of ACDT?
The standard time is Australian Central Standard Time (ACST), which is UTC+9:30. ACDT is ACST plus one hour during daylight saving.