What UTC offset does London use?

London uses Greenwich Mean Time (GMT, UTC+0) from late October through late March, and British Summer Time (BST, UTC+1) from late March through late October. The UK switches clocks on the last Sunday in March and the last Sunday in October, different dates from the US transition.

What are typical business hours in London?

Standard business hours in London run 9 AM to 5:30 or 6 PM, Monday through Friday. The financial sector, particularly in the City of London and Canary Wharf, often starts earlier at 7 or 8 AM. Lunch is typically taken from 1 to 2 PM, and it is customary to actually leave the desk for lunch.

What is the time difference between London and New York?

London is normally 5 hours ahead of New York (EST). During summer when both observe DST, London (BST, UTC+1) is still 5 hours ahead of New York (EDT, UTC−4). However, in late March and late October there are brief windows when only one zone has transitioned, making the gap 4 or 6 hours.

Working Hours in London: A Timezone Guide

January 13, 2026

London is one of the world’s most important business hubs, sitting in a timezone — Greenwich Mean Time or British Summer Time — that gives it unusually good overlap with both the Americas and much of Europe and the Middle East. For global teams, London is often the natural meeting-room anchor point, straddling the gap between New York and Frankfurt with relative ease.

UTC Offset and the GMT/BST Switch

The United Kingdom observes GMT (UTC+0) during winter and British Summer Time (BST, UTC+1) during summer. Clocks spring forward on the last Sunday of March and fall back on the last Sunday of October — slightly different dates from the US transition in early November. This means there are two brief windows each year (around the US/UK transition weeks) when London’s offset from New York is 4 or 6 hours instead of the usual 5.

For scheduling purposes, you should always check the exact offset during March and October rather than assuming the usual 5-hour gap. Many missed calls between the US and UK occur during these transition weeks.

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Business Hours and Work Culture

Standard London office hours run from 9 AM to 5:30 or 6 PM. The financial district — the City of London and Canary Wharf — operates on a tighter schedule, with many traders and analysts arriving by 7 AM and markets trading from 8 AM. Investment banking and consulting firms routinely see staff until 9 or 10 PM, while the rest of the business world maintains a more contained day.

Lunch culture in London is notable: despite the city’s intensity, it is genuinely customary to step away from the desk for a lunch break, typically from 1 to 2 PM. This is a meaningful distinction from New York, where desk lunches are widespread. Scheduling meetings over the 1–2 PM London window is less reliable than the rest of the afternoon.

Tip

For transatlantic calls with New York, the 9–11 AM London window (4–6 AM EST) is too early for most Americans. The practical US/UK overlap is 2–5 PM London time (9 AM–12 PM EST in winter), which suits both markets’ mid-morning or post-lunch slot.

Scheduling Windows with Major Global Cities

City	Offset from London (Winter)	Best Meeting Window (London Time)
New York	−5 hours	2–5 PM GMT
Los Angeles	−8 hours	4–6 PM GMT
Toronto	−5 hours	2–5 PM GMT
Paris / Berlin	+1 hour	9 AM–5 PM GMT
Dubai	+4 hours	9 AM–1 PM GMT
Mumbai	+5.5 hours	9–11:30 AM GMT
Singapore	+8 hours	9–10 AM GMT
Tokyo	+9 hours	9 AM GMT (tight overlap)
Sydney	+11 hours (summer)	8–9 AM GMT only

Note

London’s excellent overlap with Paris, Frankfurt, and Amsterdam makes it the natural scheduler for pan-European calls. For Asia-Pacific, London is better placed than New York but still faces a challenging overlap, particularly with Sydney and Tokyo where only the first hour of London’s day coincides with late afternoon in those cities.

Public Holidays and Market Closures

The UK has eight public holidays (Bank Holidays) per year, including Good Friday, Easter Monday, and three late spring/summer bank holidays in May and August. The London Stock Exchange is closed on all UK bank holidays. If you coordinate financial transactions or depend on London liquidity, building a UK bank holiday calendar into your scheduling process is worthwhile.

Christmas (December 25) and Boxing Day (December 26) are both public holidays in the UK. Combined with New Year’s Day on January 1, the period from December 24 through January 2 is effectively a slow period in London’s business year.

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Current Time in LondonSee London’s current local time, UTC offset, and whether the UK is on GMT or BST.

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Frequently Asked Questions

What UTC offset does London use?: London uses Greenwich Mean Time (GMT, UTC+0) from late October through late March, and British Summer Time (BST, UTC+1) from late March through late October. The UK switches clocks on the last Sunday in March and the last Sunday in October, different dates from the US transition.
What are typical business hours in London?: Standard business hours in London run 9 AM to 5:30 or 6 PM, Monday through Friday. The financial sector, particularly in the City of London and Canary Wharf, often starts earlier at 7 or 8 AM. Lunch is typically taken from 1 to 2 PM, and it is customary to actually leave the desk for lunch.
What is the time difference between London and New York?: London is normally 5 hours ahead of New York (EST). During summer when both observe DST, London (BST, UTC+1) is still 5 hours ahead of New York (EDT, UTC−4). However, in late March and late October there are brief windows when only one zone has transitioned, making the gap 4 or 6 hours.