GMT to EST
-5hGMT
GMTSOURCEEST
ESTGreen rows indicate typical business hours (9 AM - 5 PM)
GMT and EST on the World Map
The map below highlights the GMT (Greenwich Mean Time) and EST (Eastern Standard Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
EST – Eastern Standard Time
UTC-05:00Eastern Standard Time (EST) is the time zone for the eastern United States and Canada, 5 hours behind UTC.
- •EST is the most widely used time zone in the United States by population.
- •The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
- •23 US states are fully or partially in the Eastern Time Zone.
- •EST was established by the Standard Time Act of 1918.
- •Over 47% of the US population lives in the Eastern Time Zone.
Time Conversion Guide: GMT to EST
GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. EST runs on Eastern Standard Time (EST) at UTC-05:00. That puts GMT 5 hours behind EST — a difference of -5h at the current offsets.
In practice, when it is 9:00 AM in GMT it is 4:00 AM in EST. Midnight in GMT is 7:00 PM in EST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GMT to EST time conversion table
| GMT (GMT) | EST (EST) | Day |
|---|---|---|
| 12:00 AM | 7:00 PM | previous day |
| 6:00 AM | 1:00 AM | same day |
| 7:00 AM | 2:00 AM | same day |
| 8:00 AM | 3:00 AM | same day |
| 9:00 AM | 4:00 AM | same day |
| 12:00 PM | 7:00 AM | same day |
| 3:00 PM | 10:00 AM | same day |
| 5:00 PM | 12:00 PM | same day |
| 6:00 PM | 1:00 PM | same day |
| 9:00 PM | 4:00 PM | same day |
Why people convert GMT to EST time
- Scheduling a call from GMT to EST: a 10:00 AM start in GMT lands at 5:00 AM in EST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both GMT and EST are inside the 9-to-5 working day between 2:00 PM and 5:00 PM GMT time (9:00 AM–12:00 PM EST). That is roughly 3 hours of usable overlap.
- Booking travel or deliveries: tracking EST local time against GMT keeps pickup windows and arrival estimates honest across the -5h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a -5h gap is not.
- Block 2:00 PM–5:00 PM GMT as the recurring meeting window if you work primarily from GMT and need EST colleagues present.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
About EST (Eastern Standard Time)
Eastern Standard Time (EST) is observed during the winter months in the eastern part of North America. It covers 23 US states and parts of Canada including Ontario and Quebec. EST is the most populous time zone in the United States, home to major financial centers like New York City and global organizations headquartered in Washington D.C. During daylight saving time (March–November), clocks shift to Eastern Daylight Time (EDT, UTC-04:00). The time zone also covers parts of the Caribbean and Central America including Panama, Jamaica, and the Cayman Islands.
Best time to call between GMT and EST
Both GMT and EST sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM GMT, which is 9:00 AM–12:00 PM EST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
GMT and EST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
GMT is 5 hours behind EST (GMT UTC+00:00 → EST UTC-05:00). The shared working window is 2:00 PM–5:00 PM GMT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
GMT
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
EST
☀ Currently in DST
Standard: UTC-05:00 · DST: UTC-04:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between GMT and EST?
GMT (GMT, UTC+00:00) is 5 hours behind EST (EST, UTC-05:00). The gap is currently -5h.
How do I convert GMT time to EST time?
Add -5h to GMT local time. For example, 9:00 AM in GMT is 4:00 AM in EST.
What time is it in EST right now?
EST uses EST at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from GMT.
What is the best time to call EST from GMT?
Call between 2:00 PM and 5:00 PM GMT — that maps to 9:00 AM–12:00 PM EST and keeps both parties inside the working day.
Which is behind, GMT or EST?
GMT is 5 hours behind EST. When it is 12:00 PM in GMT it is 7:00 AM in EST.
Does daylight saving time affect the GMT–EST difference?
Neither zone observes daylight saving time, so the -5h offset between GMT and EST is fixed all year.
Which other cities share GMT's time zone?
GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use GMT, GMT's zone?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between GMT and EST?
Not normally. The -5h gap only pushes the date over the previous day.
What is the time difference between GMT and EST?
EST is -5h from GMT.
What timezone is GMT in?
GMT operates on its local timezone.
What timezone is EST in?
EST operates on its local timezone.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
Which cities are in the EST timezone?
Major cities in the EST timezone include New York City, Washington D.C., Miami, Toronto, Philadelphia, Atlanta, Boston, Montreal.
What is the UTC offset for EST?
Eastern Standard Time (EST) is at UTC-05:00. During daylight saving time, it shifts to EDT.
What should I know about the EST timezone?
EST is the most widely used time zone in the United States by population. The New York Stock Exchange (NYSE) and NASDAQ operate on Eastern Time, opening at 9:30 AM EST.
When is it midnight in GMT, what time is it in EST?
When it is 12:00 AM (midnight) in GMT (GMT), it is -5h later in EST (EST).
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See every conversion from GMT →·See every conversion from EST →