GMT to EST Time Converter

Convert Greenwich Mean Time to Eastern Standard Time - Quick & Accurate

London (GMT)
New York (EST)
EST is 5 hours behind GMT (4 during EDT/BST)

Quick Time Conversion

London
Greenwich Mean Time
UTC+0 (GMT) / UTC+1 (BST)
New York
Eastern Standard Time
UTC-5 (EST) / UTC-4 (EDT)

Current Time Right Now

Greenwich Mean Time
Eastern (EST/EDT)

Updates live every second

24-Hour Visual Comparison

GMT (London)
12am GMT
1am GMT
2am GMT
3am GMT
4am GMT
5am GMT
6am GMT
7am GMT
8am GMT
9am GMT
10am GMT
11am GMT
12pm GMT
1pm GMT
2pm GMT
3pm GMT
4pm GMT
5pm GMT
6pm GMT
7pm GMT
8pm GMT
9pm GMT
10pm GMT
11pm GMT
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EST (NY)
7pm EST
8pm EST
9pm EST
10pm EST
11pm EST
12am EST
1am EST
2am EST
3am EST
4am EST
5am EST
6am EST
7am EST
8am EST
9am EST
10am EST
11am EST
12pm EST
1pm EST
2pm EST
3pm EST
4pm EST
5pm EST
6pm EST
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Business Hours (9AM-5PM)
Evening (5PM-9PM)
Night (9PM-6AM)

Hover over any hour to see corresponding time in both zones

Best Time for Meeting/Call

To schedule a meeting between GMT and EST:

Best Window (GMT)
1:00 PM - 6:00 PM
Which is (EST)
8:00 AM - 1:00 PM
Both parties in business hours
5-hour overlap window
Ideal for UK-US East Coast collaboration

Pro Tip: Schedule calls between 2:00 PM - 4:00 PM GMT for optimal overlap with EST business hours

Complete GMT to EST Conversion Table

GMT TimeEST TimeContext
12:00 AM07:00 PM
Midnight GMT
01:00 AM08:00 PM
Late Night
02:00 AM09:00 PM
Late Night
03:00 AM10:00 PM
Late Night
04:00 AM11:00 PM
Late Night
05:00 AM12:00 AM
Late Night
06:00 AM01:00 AM
Early Morning GMT
07:00 AM02:00 AM
Night Time
08:00 AM03:00 AM
Work Starts GMT
09:00 AM04:00 AM
Business Hours GMT
10:00 AM05:00 AM
Business Hours GMT
11:00 AM06:00 AM
Business Hours GMT

Greenwich Mean Time (GMT)

UTC+0
UTC+1 during BST
Major Cities:
  • • London
  • • Manchester
  • • Birmingham
  • • Liverpool
  • • Edinburgh
Daylight Saving:

BST (UTC+1) from March to October

IANA Identifier:

Europe/London

Eastern Standard Time (EST)

UTC-5
UTC-4 during EDT
Major Cities:
  • • New York
  • • Miami
  • • Atlanta
  • • Boston
  • • Philadelphia
Daylight Saving:

EDT (UTC-4) from March to November

IANA Identifier:

America/New_York

Greenwich Mean Time (GMT) vs Eastern Standard Time (EST)

Greenwich Mean Time (GMT)Eastern Standard Time (EST)

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is UTC+0 during winter and UTC+1 during British Summer Time (BST).

Eastern Standard Time (EST) is 5 hours behind Coordinated Universal Time (UTC-5). During daylight saving time, the region observes Eastern Daylight Time (EDT), which is UTC-4.

Where Is It Used?

  • United Kingdom: London, Manchester, Birmingham, Liverpool, Edinburgh
  • Ireland: Dublin (uses GMT/IST)
  • Portugal: Lisbon (mainland)
  • West Africa: Ghana, Senegal, Mali, Ivory Coast
  • Iceland: Reykjavik (GMT year-round)
  • United States: New York, Florida, Georgia, Pennsylvania, Ohio, Michigan, Virginia, North Carolina, Massachusetts
  • Canada: Ontario, Quebec, Nunavut (eastern portions)
  • Caribbean: Bahamas, Jamaica, Haiti, Cayman Islands
  • South America: Panama, Colombia, Peru, Ecuador

Key Facts

  • UTC Offset: UTC+0 (GMT) / UTC+1 (BST)
  • Region: Western Europe, West Africa
  • Known For: Historical reference point for timekeeping
  • Largest Cities: London (9M metro), Dublin (1.4M metro)
  • Unique: Prime Meridian passes through Greenwich
  • Daylight Saving: BST from last Sunday in March to last Sunday in October
  • UTC Offset: UTC-5 (EST) / UTC-4 (EDT)
  • Region: Most populous time zone in North America
  • Known For: Major financial and cultural centers
  • Largest Cities: New York City (8.3M), Toronto (2.9M), Philadelphia (1.6M)
  • Coverage: Approximately 45% of US population
  • Daylight Saving: Begins 2nd Sunday in March, ends 1st Sunday in November

Quick Reference

Time Difference: EST is 5 hours behind GMT (4 hours during EDT/BST)
Consistency: Usually stays at 5 hours, but brief periods of 4-hour difference exist when DST dates don't align
Distance: Approximately 3,500 miles across the Atlantic Ocean
UTC Offsets: GMT = UTC+0, BST = UTC+1 | EST = UTC-5, EDT = UTC-4 (during DST)
2025 DST: UK: March 30 - October 26 | US: March 9 - November 2

Frequently Asked Questions

EST (Eastern Standard Time) is 5 hours behind GMT (Greenwich Mean Time). During EDT/BST, when both observe daylight saving, EST is 4 hours behind GMT.

The best time to call from GMT to EST is between 1:00 PM and 6:00 PM GMT, which corresponds to 8:00 AM to 1:00 PM EST. This ensures both parties are within standard business hours.

Usually the difference stays at 5 hours because both regions observe DST. However, there are brief periods when the difference is 4 hours, as the US and UK change their clocks on different dates.

GMT cities include London, Manchester, Birmingham, Liverpool, and Edinburgh. EST cities include New York, Miami, Atlanta, Boston, and Philadelphia.

GMT and UTC are nearly identical for most purposes. UTC is the modern time standard, while GMT is a time zone. During winter, London uses GMT (UTC+0), and during summer it uses BST (UTC+1).

Related Time Converters

EST → GMTGMT → PSTGMT → ISTGMT → CSTEST → PSTPST → ESTIST → ESTView All