Live clocks for Sydney and London, the exact difference as it stands today, a converter preset to this pair, and the full 24-hour comparison table — daylight saving handled on both sides.
Converting from Sydney time
The full day in Sydney on today, with the matching time in London:
| Sydney | London |
|---|
Both clocks above are read live from the IANA time-zone database built into your browser — the same rule set your phone uses. “Difference today” is not a fixed fact about this pair of cities: it is computed from the two zones’ offsets right now, which is why it can legitimately read differently if you open this page in a different month.
Sydney is ahead of London by 11 hours in the British winter (Sydney on AEDT, UTC+11) and by 9 hours in the British summer (Sydney on AEST, UTC+10, London on BST, UTC+1). In the shoulder weeks — early April and early October, when only one side has changed — the gap is 10 hours. Sydney’s clocks change on the first Sundays of April and October, in the opposite season to London’s.
The 24-hour table walks the whole of today in Sydney, hour by hour, and prints the matching moment in London — including the rows where London is still on yesterday, or already on tomorrow, which are marked +1 day or −1 day. Those edge rows are exactly the ones people get wrong doing the maths in their head.
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Free — try itSydney is ahead of London by 11 hours in the British winter (Sydney on AEDT, UTC+11) and by 9 hours in the British summer (Sydney on AEST, UTC+10, London on BST, UTC+1). In the shoulder weeks — early April and early October, when only one side has changed — the gap is 10 hours. Sydney’s clocks change on the first Sundays of April and October, in the opposite season to London’s.
10:00 PM the previous evening — that is 9:00 AM in Sydney converted on a January day, when Sydney is on daylight time (AEDT, UTC+11) and London is on GMT (UTC+0). Check it any time with the converter above: the answer is worked out from the two zones’ offsets on the date you pick, so it stays right when the clocks change.
Yes, on the clock-change dates. Sydney is ahead of London by 11 hours in the British winter (Sydney on AEDT, UTC+11) and by 9 hours in the British summer (Sydney on AEST, UTC+10, London on BST, UTC+1). In the shoulder weeks — early April and early October, when only one side has changed — the gap is 10 hours. Sydney’s clocks change on the first Sundays of April and October, in the opposite season to London’s.
There is honestly no comfortable business-hours overlap: Sydney’s 9-to-5 is London’s night. The workable windows are London early morning (8:00 AM London = 7:00 PM Sydney in January) or London’s evening (9:00 PM London = 8:00 AM Sydney). Pick which side takes the unsocial hour and rotate it.
From timestamps and the IANA time-zone database inside your browser — the live rules for each zone, including daylight-saving start and end dates and southern-hemisphere seasons where relevant. Nothing is hard-coded: open this page on a clock-change day and the clocks, the difference and the 24-hour table all follow the new offsets automatically.
Two offsets and one subtraction — the same method the converter at the top of this page runs:
Take 9:00 AM in Sydney, on a January day, when Sydney is on daylight time (AEDT, UTC+11) and London is on GMT (UTC+0). Adding the pair’s difference for that date gives 10:00 PM the previous evening in London. The subtlety is that the difference itself is date-dependent for most pairs: repeat the same conversion in a month when one city has changed its clocks and the answer moves by an hour. That is why this page never prints a single fixed “the difference is X” without the word today next to it.
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