Time Difference: London and New York
New York is 5 hours behind London. When it is noon in London, it is 7:00 AM in New York.
Daylight saving note: Can briefly be −4 hours (early spring, US shifts first) or −6 hours (late autumn, UK reverts first) during DST transition weeks.
From London's Perspective: Waiting for New York to Wake Up
From a London office, New York is 5 hours behind. The practical consequence: London's entire morning (9:00 AM–2:00 PM GMT) happens before New York even starts work. London professionals working with US counterparts typically reserve their afternoons for transatlantic calls.
When does New York become reachable from London? From London (GMT), New York enters business hours at 2:00 PM (9:00 AM EST). That gives London a 3-hour window — 2:00 PM to 5:00 PM GMT — before London's business day ends. UK-based companies with heavy US business often find their London teams working later into the afternoon precisely because of this.
The gap can briefly become 4 or 6 hours during DST transition weeks. In spring, the US shifts clocks a few weeks before the UK, making New York temporarily only 4 hours behind. In autumn, the UK reverts to GMT while the US is still on EDT — pushing New York 6 hours behind for roughly two weeks.
Data point: The London–New York air route is one of the world's busiest long-haul routes, with over 4 million passengers annually, reflecting the depth of the UK-US business relationship. UK Civil Aviation Authority Route Statistics 2023
London to New York Conversion Table
This reference table uses the baseline offset (-5h). Use the live clocks above for the current offset, especially when daylight saving changes either city.
| 🇬🇧 London (GMT) | 🇺🇸 New York (ET) | Note |
|---|---|---|
| 00:00 | 19:00 | prev day |
| 03:00 | 22:00 | prev day |
| 06:00 | 01:00 | |
| 09:00 | 04:00 | |
| 12:00 | 07:00 | |
| 15:00 | 10:00 | |
| 18:00 | 13:00 | |
| 21:00 | 16:00 |
* "next day" / "prev day" = the converted time falls on a different calendar date.
The London Afternoon Call Block
Most London-based financial institutions, law firms, and media companies schedule New York calls in a block from 2:00 PM to 5:00 PM GMT. This maps to 9:00 AM–12:00 PM New York (EST) — the prime morning slot for US colleagues. Scheduling calls before 2:00 PM London means asking New York to join before their 9:00 AM start.
Avoiding London-New York Time Mistakes
The safest way to use this page is to treat the live clocks and the conversion table as two different tools. The live clocks show what is true right now. The table gives you a quick reference based on the page's stated offset, which is useful for planning but still needs the daylight saving note when the two places change clocks on different dates.
Always check the calendar date when the converted time lands near midnight. A late evening time in London can become the next day in New York, and an early morning time can still be the previous day on the other side. That date shift is the part people miss most often when they copy only the clock time into an email or spreadsheet.
For recurring meetings, verify the same slot twice: once in January and once in July. If the answer changes, daylight saving time is involved. Put both local times in the calendar invite, include the timezone abbreviation, and update the invite before the next clock-change week. That is much safer than writing "9 AM your time" and assuming everyone's calendar will interpret it the same way.
If this is a one-off event, use the live clocks above before sending the final time. If you need a custom hour that is not shown in the table, open the related converter or meeting scheduler and enter the exact date and time. That keeps the result tied to the correct timezone rules instead of a memorized offset.
Abbreviations can be slippery, too. ET can mean EST or EDT depending on the season; London can mean GMT or BST; Sydney can mean AEST or AEDT. When accuracy matters, the city name and IANA timezone are safer than the abbreviation alone. This page uses the city timezone for the live clocks, then explains the seasonal abbreviation changes in the note so you can see why the displayed offset may differ from a simple winter table.
Frequently Asked Questions
Is New York behind or ahead of London?
New York is behind London. The standard difference is 5 hours — GMT is ahead of EST. When it is 9:00 AM New York, it is already 2:00 PM in London.
What time is 3 PM London in New York?
3:00 PM London (GMT) is 10:00 AM New York (EST). During UK BST (summer), 3:00 PM BST is 10:00 AM EDT — assuming the US has also shifted to daylight time.
Why does the London–New York difference sometimes change to 4 or 6 hours?
The US and UK change their clocks on different Sundays. In spring, the US shifts first — creating a 2-week window where the gap is 4 hours (EDT vs GMT). In autumn, the UK reverts first — creating a 2-week window where it is 6 hours (EDT vs GMT). Outside those windows, the standard 5-hour difference applies.
What time do London banks usually call New York?
Most London financial institutions target 2:00–5:00 PM GMT for New York calls — that is 9:00 AM–12:00 PM EST in New York. The early London afternoon is typically reserved for US calls, with European calls happening in the morning.