AEST ↔ GMT Time Converter

Greenwich Mean Time (GMT) is 10h behind of Australian Eastern Standard Time (AEST). AEST runs at UTC+10 / UTC+11 (AEDT) and GMT at UTC+0 / UTC+1 (BST). Quick time examples: 8:00 AM AEST = 10:00 PM GMT; 12:00 PM AEST = 2:00 AM GMT; 5:00 PM AEST = 7:00 AM GMT.

To convert AEST to GMT, subtract 10 hours to the AEST time. For example, 12:00 PM AEST becomes 2:00 AM GMT. When the result crosses midnight, advance the date by one day (shown as "+1 Day" in the converter). The converter on this page handles all arithmetic and date-rollover automatically.

Greenwich Mean Time (GMT) is 10h behind of Australian Eastern Standard Time (AEST). Reversed: AEST is 10h ahead of GMT. Practical example: noon in London (12:00 PM GMT) corresponds to 10:00 PM AEST in Sydney, and 5 PM in London corresponds to 3:00 AM AEST.

Australian Eastern Standard Time (AEST) is the standard civil time for Sydney and the surrounding region, operating at UTC+10 / UTC+11 (AEDT) from UTC. It observes Daylight Saving Time and advances its clocks by one hour during summer — the effective offset changes seasonally. Major cities: Sydney, Melbourne, Brisbane, Canberra, Hobart, Newcastle, Gold Coast.

Greenwich Mean Time (GMT) covers London and the surrounding region at UTC+0 / UTC+1 (BST) from UTC. It observes Daylight Saving Time and shifts its clocks seasonally. Cities in this zone: London, Dublin, Lisbon, Reykjavik, Accra, Abidjan, Dakar.

Both AEST and GMT observe Daylight Saving Time, though their transition dates may not align. When both zones shift simultaneously the offset stays unchanged; during brief transition windows when only one has moved, the gap differs by one hour. The live converter handles this using the browser's IANA timezone data.

The best meeting window is where standard working hours (9 AM – 6 PM) overlap in both zones. Since GMT is 10h behind of AEST, mornings in the earlier zone align with afternoons or evenings in the later zone. Target 8 AM – 11 AM in the earlier-offset zone to keep both sides in reasonable hours. The meeting hours table above shows the exact recommended slots for this pair. Any time where one side falls before 7 AM or after 9 PM is best avoided for regular team calls.

Type any time directly into the GMT field in the bidirectional converter above — it instantly shows the AEST result. Alternatively, add 10 hours from the GMT time manually. For a dedicated reverse page, visit: GMT to AEST converter ↗.

Yes — this is a large offset, and many hours will cross midnight. When the converted time passes 11:59 PM, the date advances — the converter shows "+1 Day". When it goes before 12:00 AM, the date moves back — "-1 Day" appears. The 24-hour reference table also shows day changes in the Day column. Always check the date indicator when sending calendar invites across these two zones to avoid accidentally booking on the wrong date.

Australian Eastern Standard Time (AEST) is used in: Sydney, Melbourne, Brisbane, Canberra, Hobart, Newcastle, Gold Coast. The zone operates at UTC+10 / UTC+11 (AEDT)and shifts by one hour during DST.

Greenwich Mean Time (GMT) covers: London, Dublin, Lisbon, Reykjavik, Accra, Abidjan, Dakar. It runs at UTC+0 / UTC+1 (BST)and observes Daylight Saving Time seasonally. Use the live clocks at the top of this page to see the current local time in both zones side by side.

The standard offset is 10h behind, but this can shift by one hour during DST transition periods. Both zones observe DST, so during transition windows the gap may temporarily differ. The live converter always shows the current accurate offset.

When creating a recurring meeting that spans AEST and GMT, set the event timezone in your calendar app using the IANA timezone names: Australia/Sydney for AEST and Europe/London for GMT. Using IANA names rather than fixed UTC offsets ensures the calendar app automatically adjusts future occurrences for any DST changes, so you never accidentally schedule at the wrong time after a clock transition. For a quick lookup of any specific time, the converter on this page is the fastest way to verify both sides before you send the invite.

AEST (Australian Eastern Standard Time) is UTC+10 and applies during Australian winter (approximately April to October). AEDT (Australian Eastern Daylight Time) is UTC+11 and applies during Australian summer (October to April), when New South Wales, Victoria, Tasmania, and the ACT move their clocks forward. Queensland does not observe DST and stays at AEST/UTC+10 all year. The live converter on this page uses the Sydney/Melbourne zone which switches between AEST and AEDT automatically — if you are scheduling specifically with Brisbane (Queensland), subtract one hour from any AEDT result during the October–April period.