GMT vs AEST
Greenwich Mean Time / UK (GMT/BST) is UTC+0 in winter and UTC+1 in summer. Australian Eastern Time (AEST/AEDT) is UTC+11 in winter and UTC+10 in summer.
Because the two regions change their clocks on different dates, the gap changes during the year: 11 hours ahead in the northern winter and 9 hours ahead in summer, with a few weeks in spring and autumn where it's an hour different again. The converter uses the exact rules for the date you choose.
GMT to AEST conversion table
Summer (daylight saving) times, mid-July:
| GMT/BST | AEST/AEDT |
|---|---|
| 12:00 AM | 9:00 AM |
| 6:00 AM | 3:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 12:00 PM | 9:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM (+1 day) |
| 5:00 PM | 2:00 AM (+1 day) |
| 6:00 PM | 3:00 AM (+1 day) |
| 8:00 PM | 5:00 AM (+1 day) |
| 10:00 PM | 7:00 AM (+1 day) |
Winter (standard) times, mid-January:
| GMT | AEST |
|---|---|
| 12:00 AM | 11:00 AM |
| 6:00 AM | 5:00 PM |
| 8:00 AM | 7:00 PM |
| 9:00 AM | 8:00 PM |
| 10:00 AM | 9:00 PM |
| 12:00 PM | 11:00 PM |
| 2:00 PM | 1:00 AM (+1 day) |
| 3:00 PM | 2:00 AM (+1 day) |
| 5:00 PM | 4:00 AM (+1 day) |
| 6:00 PM | 5:00 AM (+1 day) |
| 8:00 PM | 7:00 AM (+1 day) |
| 10:00 PM | 9:00 AM (+1 day) |
Scheduling between GMT and AEST
With 9 hours between them there is little or no overlap in normal working hours; one side will be early morning or evening. 8 AM GMT is 5:00 PM AEST, and 6 PM GMT is 3:00 AM AEST (+1 day). Always write the city alongside the abbreviation in invites — several abbreviations (CST, IST, AST) are used by more than one region.
Related conversions
GMT to EST · EST to GMT · GMT to PST · PST to GMT · GMT to CST · CST to GMT · GMT to IST · IST to GMT · EST to AEST · AEST to EST · all zones