ACST to GMT converter
GMT is 9.5 hours behind ACST right now. Live clocks on both sides, a direct time input, the full 24-hour table with a permalink per hour, and the real daylight-saving state — computed from the IANA tz database on every request, never from a stored offset.
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
Greenwich Mean Time
Etc/GMT is currently on GMT (UTC+00:00).
no clock change scheduled — this zone is 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.
Australian Central Standard Time
Australia/Adelaide is on ACST (UTC+09:30).
next change: Sun, 4 Oct 2026 03:00 local → ACDT (51 days)
ACST is UTC+9:30, one of the handful of half-hour offsets still in daily use. Adelaide moves to ACDT (UTC+10:30) in the southern summer; Darwin stays on ACST.
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.
ACST to GMT, hour by hour 13 August 2026 · every row is a permalink
| ACST | GMT | 12-hour | Day | Permalink |
|---|---|---|---|---|
| 00:00 | 14:30 GMT | 2:30 PM | previous day | 00:00 → |
| 01:00 | 15:30 GMT | 3:30 PM | previous day | 01:00 → |
| 02:00 | 16:30 GMT | 4:30 PM | previous day | 02:00 → |
| 03:00 | 17:30 GMT | 5:30 PM | previous day | 03:00 → |
| 04:00 | 18:30 GMT | 6:30 PM | previous day | 04:00 → |
| 05:00 | 19:30 GMT | 7:30 PM | previous day | 05:00 → |
| 06:00 | 20:30 GMT | 8:30 PM | previous day | 06:00 → |
| 07:00 | 21:30 GMT | 9:30 PM | previous day | 07:00 → |
| 08:00 | 22:30 GMT | 10:30 PM | previous day | 08:00 → |
| 09:00 | 23:30 GMT | 11:30 PM | previous day | 09:00 → |
| 10:00 | 00:30 GMT | 12:30 AM | same day | 10:00 → |
| 11:00 | 01:30 GMT | 1:30 AM | same day | 11:00 → |
| 12:00 | 02:30 GMT | 2:30 AM | same day | 12:00 → |
| 13:00 | 03:30 GMT | 3:30 AM | same day | 13:00 → |
| 14:00 | 04:30 GMT | 4:30 AM | same day | 14:00 → |
| 15:00 | 05:30 GMT | 5:30 AM | same day | 15:00 → |
| 16:00 | 06:30 GMT | 6:30 AM | same day | 16:00 → |
| 17:00 | 07:30 GMT | 7:30 AM | same day | 17:00 → |
| 18:00 | 08:30 GMT | 8:30 AM | same day | 18:00 → |
| 19:00 | 09:30 GMT | 9:30 AM | same day | 19:00 → |
| 20:00 | 10:30 GMT | 10:30 AM | same day | 20:00 → |
| 21:00 | 11:30 GMT | 11:30 AM | same day | 21:00 → |
| 22:00 | 12:30 GMT | 12:30 PM | same day | 22:00 → |
| 23:00 | 13:30 GMT | 1:30 PM | same day | 23:00 → |