Working hours: 09:00–17:00 local. Green = both working.Purple = one side only.
Frequently Asked Questions
What is the difference between gmt and est?
Greenwich Mean Time (gmt) is UTC+1 and Eastern Standard Time (est) is UTC-4. The difference between them is 5 hours.
Where is gmt used?
Greenwich Mean Time (gmt) is used in United Kingdom and surrounding regions. The IANA timezone identifier is Europe/London.
Where is est used?
Eastern Standard Time (est) is used in USA and surrounding regions. The IANA timezone identifier is America/New_York.
How do I convert gmt to est?
Use the interactive converter above. Drag the time slider to any gmt time and the est equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
GMT (London) is 5 hours ahead of EST (New York). Midday in GMT (London) lines up with 07:00 in EST (New York).
GMT (London) observes Europe/London and EST (New York) observes America/New_York — a 5 hours gap between them.
Mutual working hours
There is a 3-hour window each day where both GMT (London) and EST (New York) are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
GMT (London)
EST (New York)
Overlap (3h)
Optimal meeting slots
GMT (London) and EST (New York) share 3 hours of business hours overlap daily.
14:00 London / 09:00 New York✓ Both working
15:00 London / 10:00 New York✓ Both working
16:00 London / 11:00 New York✓ Both working
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
GMT (London)7 holidays
Jun 15World Cup Bank HolidaySOON
Jul 13Battle of the Boyne
Aug 3Summer Bank Holiday
Aug 31Summer Bank Holiday
Nov 30Saint Andrew's Day
EST (New York)8 holidays
Jun 19Juneteenth National Independence DaySOON
Jul 3Independence Day
Sep 7Labour Day
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
How to work with GMT (London) and EST (New York) time zones
Coordinating between GMT (London) (United Kingdom) and EST (New York) (USA) means working around a 5-hour time difference. The 3-hour overlap window gives both teams a natural slot for real-time collaboration without anyone working outside normal hours.
💡 How to schedule across these time zones
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Schedule at 14:00–15:00 (GMT (London)) for a 09:00–10:00 slot in EST (New York) — the sweet spot where both teams are working.
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Schedule at 15:00–16:00 (GMT (London)) for a 10:00–11:00 slot in EST (New York) — the sweet spot where both teams are working.
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Schedule at 16:00–17:00 (GMT (London)) for a 11:00–12:00 slot in EST (New York) — the sweet spot where both teams are working.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any GMT (London) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
