12am in Atlantic Standard Time is 3am in Coordinated Universal Time.

Frequently asked

Quick answers about converting between Atlantic Standard Time and Coordinated Universal Time. Can't find what you need? Email [email protected].

What is the time difference between Atlantic Standard Time and Coordinated Universal Time?

Atlantic Standard Time is 3 hours behind Coordinated Universal Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 12am in Atlantic Standard Time, what time is it in Coordinated Universal Time?

12am in Atlantic Standard Time is 3am in Coordinated Universal Time. It lands deep outside working hours in Coordinated Universal Time — see the best time to meet below for a friendlier slot. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Atlantic Standard Time and Coordinated Universal Time?

9am–2pm in Atlantic Standard Time lines up with 12pm–5pm in Coordinated Universal Time — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — ADT and UTC — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.