Enter the time
Pick the date and the time; the source zone is already set.
GMT to EST converter
Enter a date and a time and see it converted from Greenwich Mean Time / London to Eastern Time (New York). Daylight saving is handled for you, so the result is right on any date of the year.
- Free
- No sign-up
- Runs in your browser
100% private — the calculation is done in your browser and nothing is sent to any server.
Next step
Keep going with your result in another tool. Nothing is uploaded.
How it works
Read the result
The converted time appears with its date and UTC offset.
Add more zones
Compare up to four target zones at once.
How to convert GMT to EST
To convert GMT to EST, subtract 5 hours (normally). For example, when it is 12:00 noon in Greenwich Mean Time / London it is 7:00 AM in Eastern Time (New York) in winter. In the converter above the source and target zones are already selected: enter a date and a time and the result appears at once.
The two zones
London uses GMT (UTC+0) in winter and British Summer Time (BST, UTC+1) in summer. GMT is therefore the right label only for the winter months; in summer London is one hour ahead of GMT.
Eastern Time covers New York, Washington, Miami, Atlanta, Boston and Toronto. It is Eastern Standard Time (EST, UTC−5) in winter and Eastern Daylight Time (EDT, UTC−4) in summer, so people often write ET for both.
The difference between GMT and EST
London is on GMT in winter and BST in summer, and New York shifts on different dates, so the gap is normally five hours but drops to four for a few weeks in March and October. Winter offset: 5 hours behind. Summer offset: 5 hours behind.
GMT to EST quick reference
| Source time | Winter (15 January) | Summer (15 July) |
|---|---|---|
| 6:00 AM | 1:00 AM | 1:00 AM |
| 9:00 AM | 4:00 AM | 4:00 AM |
| 12:00 PM | 7:00 AM | 7:00 AM |
| 3:00 PM | 10:00 AM | 10:00 AM |
| 6:00 PM | 1:00 PM | 1:00 PM |
| 9:00 PM | 4:00 PM | 4:00 PM |
When you need it
- Scheduling calls between London and New York.
- Following a UK broadcast or a football match from the East Coast.
- Working out when the London stock market opens in New York time.
Avoiding time zone mistakes
- Always say the date as well as the time: a late evening in one zone is already tomorrow in another.
- Prefer city names (New York, Los Angeles) to abbreviations; EST and EDT are different, and many people write EST all year.
- For international meetings, send the time in UTC or add a link to a converter so everyone sees their own time.
Private by design
The conversion uses your browser's own time zone database, so nothing you enter is sent anywhere.
Frequently asked questions
How many hours is EST from GMT?
EST is 5 hours behind GMT all year.
Does daylight saving change the difference?
Mostly no, but for a few weeks a year the gap is one hour shorter, because Europe and the US change their clocks on different dates.
What time is 9:00 AM GMT in EST?
It is 4:00 AM in winter and 4:00 AM in summer.
Which zone is used for the source?
The converter uses the zone selected as the source, here Greenwich Mean Time / London, and applies its daylight saving rules for the date you enter.
Is this converter free?
Yes. There is no sign-up and no limit, and it runs in your browser, so nothing you type is sent to a server.
Does it work on a phone?
Yes. It works in any modern mobile browser, and the result updates as you type.
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