This GMT to AEST converter turns any time in Greenwich Mean Time (GMT) into Australian Eastern Standard Time (AEST), using your device clock so daylight saving is applied automatically. AEST is 11 hours ahead of GMT when both zones are on standard time, and 10 hours ahead during the summer months when clocks have shifted. GMT is UTC+0; AEST is UTC+10 (AEDT: UTC+11).
GMT covers Accra, Dakar, London in winter; AEST covers Sydney, Melbourne, Canberra. Because only AEST observes daylight saving time, the difference is not constant through the year. The tables below show both cases, and the converter at the top always uses the rule in force on the date you pick.
GMT and AEST UTC offsets
GMT
UTC+0
Greenwich Mean Time
No daylight saving time
AEST
UTC+10
Australian Eastern Standard Time
AEDT UTC+11 from April 5 to October 4, 2026
GMT to AEST conversion table (standard time)
| GMT | AEST |
|---|---|
| 12 am | 11 am |
| 3 am | 2 pm |
| 6 am | 5 pm |
| 8 am | 7 pm |
| 9 am | 8 pm |
| 10 am | 9 pm |
| 11 am | 10 pm |
| 12 pm | 11 pm |
| 1 pm | 12 amnext day |
| 2 pm | 1 amnext day |
| 3 pm | 2 amnext day |
| 4 pm | 3 amnext day |
| 5 pm | 4 amnext day |
| 6 pm | 5 amnext day |
| 8 pm | 7 amnext day |
| 10 pm | 9 amnext day |
GMT to AEST during daylight saving
Between the dates listed above, the difference is 10 hours instead of 11 hours.
| GMT | AEST/AEDT |
|---|---|
| 12 am | 10 am |
| 3 am | 1 pm |
| 6 am | 4 pm |
| 8 am | 6 pm |
| 9 am | 7 pm |
| 10 am | 8 pm |
| 11 am | 9 pm |
| 12 pm | 10 pm |
| 1 pm | 11 pm |
| 2 pm | 12 amnext day |
| 3 pm | 1 amnext day |
| 4 pm | 2 amnext day |
| 5 pm | 3 amnext day |
| 6 pm | 4 amnext day |
| 8 pm | 6 amnext day |
| 10 pm | 8 amnext day |
Frequently asked questions
What is the time difference between GMT and AEST?
AEST is 11 hours ahead of GMT on standard time. During daylight saving the gap changes to 10 hours. That comes from the UTC offsets: GMT is UTC+0 and AEST is UTC+10. For example, 9 am GMT = 8 pm AEST, and in summer 9 am GMT = 7 pm AEST.
Is AEST ahead of or behind GMT?
AEST is 11 hours ahead of GMT, so when it is noon in GMT it is 11 pm in AEST. Ahead means the clock there already shows a later time; a call at 5 pm GMT lands at 4 am AEST.
Does GMT or AEST observe daylight saving time in 2026?
GMT keeps UTC+0 all year. AEST switches to AEDT (UTC+11) on April 5 and back on October 4. Between those dates the difference in the table above shifts by an hour, which is the usual cause of missed calls in spring and autumn.
What is the best time for a meeting between GMT and AEST?
Office hours (9 am to 5 pm) do not overlap at all with a 11 hours difference. The least painful options are early morning in GMT or early evening in AEST; for example 8 am GMT = 7 pm AEST and 6 pm GMT = 5 am AEST the next day. Rotate the inconvenient slot between the two sides for recurring calls.
Which cities use GMT and AEST?
GMT (Greenwich Mean Time) is used in Accra, Dakar, London in winter. AEST (Australian Eastern Standard Time) is used in Sydney, Melbourne, Canberra, Brisbane (no DST). Note that the United Kingdom is only on GMT in winter; from late March to late October London runs on British Summer Time, one hour ahead, so use the BST pages for UK business hours in summer.