EST to GMT Converter (Eastern Time to Greenwich Mean Time)

Mid-January 2026: GMT is 5 hours ahead of EST. Mid-July 2026: GMT is 4 hours ahead of EDT.

Add five hours to an Eastern Standard Time reading and you have GMT. Between the second Sunday of March and the first Sunday of November, when New York is on Eastern Daylight Time, add four hours instead. Greenwich Mean Time itself never moves, so every change in the gap comes from the American side.

People in the United States convert in this direction when they send a time to an international group, fill in a form that asks for GMT, or want a record that will be unambiguous in another country. A time written as "14:00 GMT" means the same moment everywhere.

How to use this tool

1. Pick a date and time in EST. The date matters when daylight saving time is in force.
2. Read the matching time in GMT, with both UTC offsets.
3. Use "Use current time" for now, or the tables below for a quick look.

Formula

GMT time = EST time − (EST UTC offset) + (GMT UTC offset)

The converter looks up both UTC offsets for the actual instant in the saved IANA time zone rules, so daylight saving changes are included automatically.

Example

Worked with the saved rules:

9:00 AM EST on March 2, 2026 = 2:00 PM GMT

6:30 PM EDT on August 3, 2026 = 10:30 PM GMT

Time difference through the year

The difference depends on the date when either place moves its clocks. These are the offsets on two reference days, from the saved IANA rules:

Clock changes in 2026

Between these dates the difference shifts by the size of the change.

EST to GMT time table

Each hour in Eastern Time with the matching Greenwich Mean Time time in winter and summer (reference days in January and July).

GMT to EST time table

Each hour in Greenwich Mean Time with the matching Eastern Time time in winter and summer (reference days in January and July).

Hours that work in both places

Hours (on the January reference day) that fall between 8:00 AM and 8:00 PM in both EST and GMT:

Check the summer column above when one of the places is on daylight saving time.

Don't write GMT when you mean London

Americans often call British time "GMT" all year. In summer that is wrong by an hour, since the UK is on British Summer Time, one hour ahead of GMT. If your counterpart is in London, check the UK page for the actual clock, and if the invitation really says GMT, use this page.

In the weeks when the US has changed its clocks and the UK has not, for three weeks in March and again from the last Sunday of October until the first Sunday of November, New York and London are four hours apart, not five. The time zone converter lists the local rules for other cities.

A deadline written in GMT

Online contests, grant calls and submission portals often set a deadline such as 23:59 GMT. For a New Yorker that is 6:59 p.m. in winter and 7:59 p.m. in summer on the same date, so the deadline arrives well before midnight on an Eastern clock.

A practical safeguard is to submit by the early afternoon in New York and to take a screenshot of the confirmation, which usually shows a time stamp in the portal's own zone.