ACST to GMT Converter
central Australia to UK/Ireland — a 9.5-hour gap with seasonal variation due to daylight saving. Coordination typically centers on trade, investment, and remote team management.
Time Zone Converter
Compare Times
| ACST | GMT |
|---|---|
| 8:00 AM ACST | 10:30 PM GMT |
| 9:00 AM ACST | 11:30 PM GMT |
| 10:00 AM ACST | 12:30 AM GMT |
| 11:00 AM ACST | 1:30 AM GMT |
| 12:00 PM ACST | 2:30 AM GMT |
| 1:00 PM ACST | 3:30 AM GMT |
| 2:00 PM ACST | 4:30 AM GMT |
| 3:00 PM ACST | 5:30 AM GMT |
| 4:00 PM ACST | 6:30 AM GMT |
| 5:00 PM ACST | 7:30 AM GMT |
| 6:00 PM ACST | 8:30 AM GMT |
| 7:00 PM ACST | 9:30 AM GMT |
| 8:00 PM ACST | 10:30 AM GMT |
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
GMT is 9 hours 30 minutes behind ACST (standard time).
Daylight Saving Time: ACST observes DST; GMT does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when ACST changes its clocks.
Best Meeting Times: ACST & GMT
ACST
18:30–19:30
Central Australia Time
GMT
09:00–10:00
Greenwich Time
Recommended time: 18:30 ACST / 09:00 GMT
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
ACST · Central Australia Time
Standard offset +09:30
- Starts
- Oct 4, 2026 · 02:00 → 03:00
- first_sunday_of_october
- Ends
- Apr 5, 2026 · 03:00 → 02:00
- first_sunday_of_april
- Daylight time
- ACDT · +10:30
South Australia observes DST (ACDT, UTC+10:30); the Northern Territory remains on ACST year-round. SA has used the same Sunday transition dates as the eastern states since the 2008/09 DST season — older sources stating SA changes one week later are out of date.
GMT · Greenwich Time
Standard offset +00:00
- Starts
- Mar 29, 2026 · 01:00 → 02:00
- last_sunday_of_march
- Ends
- Oct 25, 2026 · 02:00 → 01:00
- last_sunday_of_october
- Daylight time
- BST · +01:00
GMT countries vary. The UK, Ireland, and Portugal observe summer time; Iceland and most of West Africa remain on GMT year-round.
Principal Cities
ACST — Central Australia Time
- AdelaideAustralia
- DarwinAustralia
- Alice SpringsAustralia
- PalmerstonAustralia
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco
Flight Information
Route
ADL ↔ LHR
Avg. flight time
21h
Direct flights
Not available
~21h with stopover.