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When London (UTC/UTC+1) is on Summer Time and Sydney (UTC+10/UTC+11) is on Standard Time (from the 1st Sunday of April to the 1st Sunday of October), Sydney is 9 hours ahead of London.

When London and Sydney are both on Summer Time (from the last Sunday of March to the 1st Sunday of April and from the 1st Sunday of October to the last Sunday of October), Sydney is 10 hours ahead of London.

When London is on Standard Time and Sydney is on Summer Time (from the last Sunday of October to the last Sunday of March), Sydney is 11 hours ahead of London.

So in June, 1 PM BST in London = 10 PM Eastern Standard Time in Sydney.

In mid-October, 1 PM BST in London = 11 PM Eastern Summer Time in Sydney.

In December, 12 noon GMT in London = 11 PM Eastern Summer Time in Sydney.

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12y ago

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