BST to AEST Time Converter
AEST is 10 hours ahead of BST. BST is UTC+1:00, and Eastern Australia is currently on AEDT (UTC+11:00).
Best Time to Call Between BST and AEST
Standard 9-to-5 hours in these two zones never overlap, so someone has to take the call outside their working day. The most workable window is 7:00 AM to 12:00 PM BST, which is 5:00 PM to 10:00 PM AEST.
both at work BST only AEST only neither — hours along the strip are BST.
Common Times Converted
BST on the left, AEST on the right.
BST to AEST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | AEST | Working hours |
|---|---|---|
| 12:00 AM | 10:00 AM | AEST only |
| 1:00 AM | 11:00 AM | AEST only |
| 2:00 AM | 12:00 PM | AEST only |
| 3:00 AM | 1:00 PM | AEST only |
| 4:00 AM | 2:00 PM | AEST only |
| 5:00 AM | 3:00 PM | AEST only |
| 6:00 AM | 4:00 PM | AEST only |
| 7:00 AM | 5:00 PM | — |
| 8:00 AM | 6:00 PM | — |
| 9:00 AM | 7:00 PM | BST only |
| 10:00 AM | 8:00 PM | BST only |
| 11:00 AM | 9:00 PM | BST only |
| 12:00 PM | 10:00 PM | BST only |
| 1:00 PM | 11:00 PM | BST only |
| 2:00 PM | 12:00 AM next day | BST only |
| 3:00 PM | 1:00 AM next day | BST only |
| 4:00 PM | 2:00 AM next day | BST only |
| 5:00 PM | 3:00 AM next day | — |
| 6:00 PM | 4:00 AM next day | — |
| 7:00 PM | 5:00 AM next day | — |
| 8:00 PM | 6:00 AM next day | — |
| 9:00 PM | 7:00 AM next day | — |
| 10:00 PM | 8:00 AM next day | — |
| 11:00 PM | 9:00 AM next day | AEST only |
What BST and AEST Actually Are
BST — British Summer Time
London, Manchester, Birmingham, Glasgow, and the rest of the UK from late March to late October. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
British Summer Time began in 1916 as a wartime fuel-saving measure and has run every year since, making it one of the oldest continuous daylight saving schemes in the world.
AEST — Australian Eastern Standard Time
Sydney, Melbourne, Brisbane, Canberra, Hobart. Standing at UTC+10:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, April 4, 2027, to AEST. Sydney and Melbourne move to AEDT (UTC+11) for the southern summer; Brisbane does not change at all.
Queensland abandoned daylight saving after a 1992 referendum, so for five months a year Brisbane and Sydney read different clocks despite sharing a zone.
What This Means in Practice
The date changes mid-working-day
For 3 of the eight hours in a normal BST working day, the equivalent AEST time falls on a different calendar date. Anything scheduled in that stretch needs the date checked as well as the time, or a Tuesday call quietly becomes a Wednesday one at the other end.
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Nearly opposite sides of the clock
At 10 hours apart, one side's morning is the other side's night. Handing work over at the end of a shift usually beats trying to get both parties in the same call.
Major Cities in Each Zone
Cities on BST
Cities on AEST
Frequently Asked Questions
What is the time difference between BST and AEST?
AEST is 10 hours ahead of BST. That is the live figure. Taken strictly as written, the gap between BST and AEST is 9 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM BST in AEST?
9:00 AM BST is 7:00 PM AEST.
What are the best hours to schedule a call between BST and AEST?
Standard business hours in these two zones do not overlap at all, so one side has to work outside the 9-to-5. The most workable window is 7:00 AM to 12:00 PM BST, which is 5:00 PM to 10:00 PM AEST.
Does the difference between BST and AEST change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
Does AEST always mean Australian Eastern Standard Time?
Sydney and Melbourne move to AEDT (UTC+11) for the southern summer; Brisbane does not change at all.