GMT to ACST Converter
UK/Ireland to central Australia — 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
| GMT | ACST |
|---|---|
| 8:00 AM GMT | 5:30 PM ACST |
| 9:00 AM GMT | 6:30 PM ACST |
| 10:00 AM GMT | 7:30 PM ACST |
| 11:00 AM GMT | 8:30 PM ACST |
| 12:00 PM GMT | 9:30 PM ACST |
| 1:00 PM GMT | 10:30 PM ACST |
| 2:00 PM GMT | 11:30 PM ACST |
| 3:00 PM GMT | 12:30 AM ACST |
| 4:00 PM GMT | 1:30 AM ACST |
| 5:00 PM GMT | 2:30 AM ACST |
| 6:00 PM GMT | 3:30 AM ACST |
| 7:00 PM GMT | 4:30 AM ACST |
| 8:00 PM GMT | 5:30 AM ACST |
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.
ACST is 9 hours 30 minutes ahead of GMT (standard time).
Daylight Saving Time: GMT observes DST; ACST does not. The offset between them shifts by 1 hour twice a year — in spring and autumn — when GMT changes its clocks.
Best Meeting Times: GMT & ACST
GMT
07:30–08:30
Greenwich Time
ACST
17:00–18:00
Central Australia Time
Recommended time: 07:30 GMT / 17:00 ACST
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
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.
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dates as the eastern states since the 2008/09 DST season — older sources stating SA changes one week later are out of date.
Principal Cities
GMT — Greenwich Time
- LondonUnited Kingdom
- DublinIreland
- LisbonPortugal
- CasablancaMorocco
ACST — Central Australia Time
- AdelaideAustralia
- DarwinAustralia
- Alice SpringsAustralia
- PalmerstonAustralia
Flight Information
Route
LHR ↔ ADL
Avg. flight time
21h
Direct flights
Not available
~21h with stopover.