Live clocks for London and Sydney, 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 London time
The full day in London on today, with the matching time in Sydney:
| London | Sydney |
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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 11 hours ahead of London in the British winter. When London moves to BST and Sydney falls back to standard time (AEST, UTC+10) around April, the gap becomes 9 hours; in the shoulder weeks when only one side has moved, it is 10 hours. The two cities change clocks in opposite seasons — London on the last Sundays of March and October, Sydney on the first Sundays of April and October.
The 24-hour table walks the whole of today in London, hour by hour, and prints the matching moment in Sydney — including the rows where Sydney 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.
Convert any moment between 44 world time zones, with offsets and DST handled.
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Free — try itSydney is 11 hours ahead of London in the British winter. When London moves to BST and Sydney falls back to standard time (AEST, UTC+10) around April, the gap becomes 9 hours; in the shoulder weeks when only one side has moved, it is 10 hours. The two cities change clocks in opposite seasons — London on the last Sundays of March and October, Sydney on the first Sundays of April and October.
8:00 PM the same evening — that is 9:00 AM in London converted on a January day, when London is on GMT (UTC+0) and Sydney is on daylight time (AEDT, UTC+11). 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 11 hours ahead of London in the British winter. When London moves to BST and Sydney falls back to standard time (AEST, UTC+10) around April, the gap becomes 9 hours; in the shoulder weeks when only one side has moved, it is 10 hours. The two cities change clocks in opposite seasons — London on the last Sundays of March and October, Sydney on the first Sundays of April and October.
London’s morning is Sydney’s evening — 8:00–10:00 AM in London reaches Sydney at 7:00–9:00 PM in January, the most civilised window. London’s evening works the other way: 9:00 PM in London is 8:00 AM in Sydney, catching the start of their day. Midday-to-midday calls simply do not exist on this route.
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 London, on a January day, when London is on GMT (UTC+0) and Sydney is on daylight time (AEDT, UTC+11). Adding the pair’s difference for that date gives 8:00 PM the same evening in Sydney. 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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