What Is EDT and When Is It Active?

EDT (Eastern Daylight Time) is UTC minus 4. It's the version of Eastern Time that the US East Coast uses during daylight saving time, which runs from the second Sunday in March through the first Sunday in November.

In 2026 specifically, EDT is active from March 8 at 2:00 AM through November 1 at 2:00 AM. During those roughly 8 months — which covers spring, summer, and most of autumn — the correct offset for New York, Boston, Washington D.C., Miami, Atlanta, and every other Eastern Time city is UTC minus 4. Not minus 5. That's EST, which applies only in winter.

So for more than half the year, when someone asks "what's this UTC time in Eastern Time," the correct answer uses EDT, not EST. This matters because using the wrong offset gives you a result that's off by an hour.

How to Convert UTC to EDT

The formula is simple: take the UTC hour and subtract 4. If the result is 13 or higher, subtract 12 to convert to PM format. If the result goes below 0, add 24 and step back to the previous calendar day.

Examples: 14 UTC minus 4 equals 10, which is 10:00 AM EDT. 18 UTC minus 4 equals 14, minus 12 equals 2:00 PM EDT. 03 UTC minus 4 equals negative 1, plus 24 equals 23:00, which is 11:00 PM EDT the previous evening.

Full UTC to EDT Reference Table

Every UTC hour and its EDT equivalent. This applies during the daylight saving period (mid-March through early November).

Notice the third column: EDT and EST are never the same for any given UTC time. EDT is always one hour later than EST for the same UTC input. That one-hour shift is the entire effect of daylight saving.

Why EDT Gets Called "EST" By Mistake

It's extremely common for people to say "Eastern Standard Time" or "EST" all year round when they actually mean Eastern Time in general. Broadcasters do it. News websites do it. Event listings do it. "8 PM EST" in July is technically wrong — it should be "8 PM EDT" — but the mistake is so universal that people mostly understand.

The technically correct catch-all term is "ET" (Eastern Time), which covers both EST and EDT without specifying the offset. When you see "ET" in a TV listing or event announcement, it means local Eastern time, whichever offset is currently active. When you need precision, use EST or EDT with the offset clearly in mind.

For UTC to EST conversions done during daylight saving season, you're technically doing a UTC to EDT conversion. The formula is minus 4, not minus 5.

When EDT and EST Create a One-Hour Mismatch

This becomes a real issue when calendar events or communications are set up assuming EST year-round. Imagine someone says "we always meet at 1700 UTC, which is noon EST." That's correct in winter. But in summer, 1700 UTC is 1 PM EDT — not noon. If the team thinks the meeting is at noon but it's actually at 1 PM local time, someone's going to be early or confused.

The solution is either to track the actual local time (which shifts by one hour in spring) or to anchor everything in UTC and let each person's calendar app handle the local conversion. The UTC time (1700) stays constant year-round. The local result (noon vs 1 PM) varies with the season.

The Short Answer

UTC to EDT means subtract 4 hours. EDT is active from mid-March through early November. During that period, every UTC to Eastern Time conversion uses minus 4, not minus 5. The rest of the year it's EST (minus 5). The UTC to EST converter detects which one applies today automatically.