23:00 GMT to ACDT
Convert an exact time type it — no sliders
Conversion runs in your browser against the same IANA rules the server uses, so it keeps working offline and nothing you type is sent anywhere.
Daylight saving right now
Australian Central Daylight Time
Australia/Adelaide is currently on ACST (UTC+09:30). That is not ACDT — this page is named for the abbreviation people search for, and tells you the truth about which one is actually in force.
next change: Sun, 4 Oct 2026 03:00 local → ACDT (51 days, clocks go forward)
ACDT is UTC+10:30, Adelaide's summer clock — a half-hour offset that also shifts for daylight saving, which is the combination most naive converters get wrong. Darwin stays on ACST and never joins it.
Greenwich Mean Time
Etc/GMT is on GMT (UTC+00:00).
no clock change scheduled — fixed at UTC+00:00
GMT is UTC+0 and never shifts. The UK observes GMT in winter only — in summer it is on BST (UTC+1), so "GMT" on a British invite dated in July usually means BST.
Best time to call green = 09:00–18:00 on both sides
No overlap inside a 09:00–18:00 day on both sides. Someone has to take an early or late slot — the table below shows exactly which hours are least bad.
GMT to ACDT, hour by hour 13 August 2026 · every row is a permalink
| GMT | ACDT | 12-hour | Day | Permalink |
|---|---|---|---|---|
| 00:00 | 09:30 ACST | 9:30 AM | same day | 00:00 → |
| 01:00 | 10:30 ACST | 10:30 AM | same day | 01:00 → |
| 02:00 | 11:30 ACST | 11:30 AM | same day | 02:00 → |
| 03:00 | 12:30 ACST | 12:30 PM | same day | 03:00 → |
| 04:00 | 13:30 ACST | 1:30 PM | same day | 04:00 → |
| 05:00 | 14:30 ACST | 2:30 PM | same day | 05:00 → |
| 06:00 | 15:30 ACST | 3:30 PM | same day | 06:00 → |
| 07:00 | 16:30 ACST | 4:30 PM | same day | 07:00 → |
| 08:00 | 17:30 ACST | 5:30 PM | same day | 08:00 → |
| 09:00 | 18:30 ACST | 6:30 PM | same day | 09:00 → |
| 10:00 | 19:30 ACST | 7:30 PM | same day | 10:00 → |
| 11:00 | 20:30 ACST | 8:30 PM | same day | 11:00 → |
| 12:00 | 21:30 ACST | 9:30 PM | same day | 12:00 → |
| 13:00 | 22:30 ACST | 10:30 PM | same day | 13:00 → |
| 14:00 | 23:30 ACST | 11:30 PM | same day | 14:00 → |
| 15:00 | 00:30 ACST | 12:30 AM | next day | 15:00 → |
| 16:00 | 01:30 ACST | 1:30 AM | next day | 16:00 → |
| 17:00 | 02:30 ACST | 2:30 AM | next day | 17:00 → |
| 18:00 | 03:30 ACST | 3:30 AM | next day | 18:00 → |
| 19:00 | 04:30 ACST | 4:30 AM | next day | 19:00 → |
| 20:00 | 05:30 ACST | 5:30 AM | next day | 20:00 → |
| 21:00 | 06:30 ACST | 6:30 AM | next day | 21:00 → |
| 22:00 | 07:30 ACST | 7:30 AM | next day | 22:00 → |
| 23:00 | 08:30 ACST | 8:30 AM | next day | 23:00 → |