12am in Irish Standard Time is 11pm in Coordinated Universal Time on the previous day.

Frequently asked

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

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

Irish Standard Time is 1 hour ahead of 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 Irish Standard Time, what time is it in Coordinated Universal Time?

12am in Irish Standard Time is 11pm in Coordinated Universal Time on the previous day. 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 Irish Standard Time and Coordinated Universal Time?

10am–5pm in Irish Standard Time lines up with 9am–4pm 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 — IST 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.