ACDT time now (Australian Central Daylight Time)
12:09AMACDT
UTC+10:30+15 h 30 min vs New York (you)Adelaide now: ACDT, UTC+10:30
No zone keeps UTC+10:30 all year, so the clock above shows Adelaide, which uses ACDT from the first Sunday of October at 2:00 AM to the first Sunday of April at 3:00 AM.
What ACDT means
ACDT stands for Australian Central Daylight Time, UTC+10:30. It is used in South Australia and Broken Hill in New South Wales.
It is a summer time: the daylight saving form of ACST (UTC+9:30), one hour ahead. In Adelaide it applies from October to April: from the first Sunday of October at 2:00 AM to the first Sunday of April at 3:00 AM.
Australia’s time zones in practice
Australia’s states choose their own clock rules. Queensland, the Northern Territory and Western Australia stay on standard time all year, while New South Wales, Victoria, Tasmania, the ACT and South Australia move forward in October and back in April. In summer this gives the east coast two different times: Sydney on AEDT (UTC+11) and Brisbane on AEST (UTC+10).
The Northern Territory, South Australia and Broken Hill use a half-hour offset, ACST (UTC+9:30); South Australia and Broken Hill move to ACDT (UTC+10:30) in summer, while Darwin does not. Lord Howe Island moves by only 30 minutes. Because the southern summer spans New Year, the year’s first clock change in Australia is the move back in April.
Where and when ACDT is used
2 zones use it for part of the year only, switching back to standard time in the other months. Computed from tzdata under the current rules.
| Main city | Time zone | Countries | When |
|---|---|---|---|
| Adelaide | Australia/Adelaide | Australia | October to April |
| Broken Hill | Australia/Broken_Hill | Australia | October to April |
How long ACDT has been used
In the tzdata record, Adelaide has used ACDT since 1916 and Broken Hill has used ACDT since 1916.
ACDT in the past
Zones whose tzdata history shows ACDT before 2025 but that no longer use it:
- Australia/Darwin (Darwin): 1916–1944
ACDT converted to other zones
Every column is a fixed offset, so this table is valid on any date. Remember that the regions behind some columns switch to summer time (EST to EDT, CET to CEST, GMT to BST); the clock in those cities is then an hour later than the column.
| ACDT (UTC+10:30) | UTC (UTC+0) | EST (UTC−5) | PST (UTC−8) | CET (UTC+1) | IST (UTC+5:30) | JST (UTC+9) | AEST (UTC+10) |
|---|---|---|---|---|---|---|---|
| 12:00 AM | 1:30 PM (−1 day) | 8:30 AM (−1 day) | 5:30 AM (−1 day) | 2:30 PM (−1 day) | 7:00 PM (−1 day) | 10:30 PM (−1 day) | 11:30 PM (−1 day) |
| 6:00 AM | 7:30 PM (−1 day) | 2:30 PM (−1 day) | 11:30 AM (−1 day) | 8:30 PM (−1 day) | 1:00 AM | 4:30 AM | 5:30 AM |
| 9:00 AM | 10:30 PM (−1 day) | 5:30 PM (−1 day) | 2:30 PM (−1 day) | 11:30 PM (−1 day) | 4:00 AM | 7:30 AM | 8:30 AM |
| 12:00 PM | 1:30 AM | 8:30 PM (−1 day) | 5:30 PM (−1 day) | 2:30 AM | 7:00 AM | 10:30 AM | 11:30 AM |
| 3:00 PM | 4:30 AM | 11:30 PM (−1 day) | 8:30 PM (−1 day) | 5:30 AM | 10:00 AM | 1:30 PM | 2:30 PM |
| 6:00 PM | 7:30 AM | 2:30 AM | 11:30 PM (−1 day) | 8:30 AM | 1:00 PM | 4:30 PM | 5:30 PM |
| 9:00 PM | 10:30 AM | 5:30 AM | 2:30 AM | 11:30 AM | 4:00 PM | 7:30 PM | 8:30 PM |