Which zone this page means. AEST applies in winter; AEDT (UTC+11) applies from the first Sunday in October to the first Sunday in April. Australian seasons are reversed, so summer time runs over the southern summer. Queensland stays on AEST all year. GMT and UTC are the same offset but not the same thing: GMT is a time zone, UTC is a time standard. The United Kingdom is on GMT in winter and BST (UTC+1) in summer.
AEST is ahead of GMT by 10 hours today
On 19 August 2026, Australian Eastern Standard Time is on AEST at UTC+10:00 and Greenwich Mean Time is on GMT at UTC+00:00. The gap between them is 10 hours, with GMT behind. So 9:00 am in AEST is 11:00 pm in GMT, and 5:00 pm in AEST is 7:00 am in GMT. Going the other way, see GMT to AEST.
The gap is not constant, and that is the part that catches people out
Australian Eastern Standard Time is currently on standard time and changes next on 4 October 2026, when clocks go forward an hour. Greenwich Mean Time does not observe daylight saving at all, so the whole of the seasonal change comes from the AEST side: the gap moves by an hour twice a year even though nothing changes in Greenwich Mean Time.
When you can actually both be at work
Taking a working day as 9:00 am to 5:00 pm local at each end, there are 0 overlapping hours in a normal day. There is none: the two working days do not touch at all, so any live meeting between Australian Eastern Standard Time and Greenwich Mean Time has to sit outside somebody's normal hours. The table above shows which end has the shorter stretch to give up.
Zone rules are set by legislation and change, sometimes at short notice. This page is built against tzdata 2026a, last reviewed 2026-08-18. Quarterly. Zone rules change by legislation, sometimes at short notice. Version and review date are shown on every zone page. The converter above reads your browser's own copy of the zone database, so if a rule has changed since this page was built the live answer follows the new rule.
Every convention used above — whether the start date counts, how month ends are clamped, which holidays close an office — is written out on the methodology page, including the daylight-saving rules behind the 10-hour gap above.