How do you convert GMT to EST?

Use EST = GMT − 5 hours. For 15:00 GMT that gives 10:00 EST.

What does 15:00 GMT actually mean?

It sits between 12 and 18 GMT; the table on this page shows how those compare.

15:00 GMT to EST

10:00 EST

15:00 Greenwich Mean Time equals 10:00 Eastern Standard Time.

These are standard-time offsets, which never change. What changes is which one a place observes: New York is on EST in winter but EDT (an hour later) during daylight saving, and the UK is on GMT in winter and BST in summer. If you mean "the time in New York right now", use the full converter — it reads live offsets.

How the conversion works

This one is a formula rather than a single multiplier:

EST = GMT − 5 hours → 10:00 EST

Going the other way: 10:00 EST to GMT.

Convert a different time zone

GMT =10:00 EST

Open the full time zone converter for every other unit.

Nearby values

GMT	EST
12:00 GMT	07:00 EST
13:00 GMT	08:00 EST
14:00 GMT	09:00 EST
16:00 GMT	11:00 EST
17:00 GMT	12:00 EST
18:00 GMT	13:00 EST

Questions

What is 15:00 GMT in EST?: 15:00 GMT is 10:00 EST.
How do you convert GMT to EST?: Use EST = GMT − 5 hours. For 15:00 GMT that gives 10:00 EST.
What does 15:00 GMT actually mean?: It sits between 12 and 18 GMT; the table on this page shows how those compare.