Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Ireland to BST

+0h

Ireland

ISTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

BST

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Ireland

BST

12:00 AM

2:00 AM

4:00 AM

6:00 AM

8:00 AM

10:00 AM

12:00 PM

2:00 PM

4:00 PM

6:00 PM

8:00 PM

10:00 PM

Green rows indicate typical business hours (9 AM - 5 PM)

IST and BST on the World Map

The map below highlights the IST (Greenwich Mean Time) and BST (British Summer Time) timezone regions across the globe.

IST Zone

→

BST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

BST – British Summer Time

UTC+01:00

British Summer Time (BST, UTC+01:00) is the daylight saving period in the United Kingdom, running from late March to late October.

Countries in BST

United Kingdom

Major Cities in BST

LondonBirminghamManchesterGlasgowEdinburghCardiffBelfastLiverpoolBristolLeeds

Key Facts about BST

•BST runs from the last Sunday in March to the last Sunday in October.
•BST is exactly one hour ahead of GMT, the UK's standard time.
•During BST, London is 4 hours ahead of New York while the US is on Eastern Daylight Time.
•The Isle of Man and the Channel Islands also observe BST.

Daylight Saving:Yes – switches to BST

Learn more about BST on Wikipedia

Ireland vs BST: Offsets, DST and Best Call Times

Ireland runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. BST runs on British Summer Time (BST) at UTC+01:00. That puts Ireland no time difference BST — a difference of +0h at the current offsets.

In practice, when it is 9:00 AM in Ireland it is 9:00 AM in BST. Midnight in Ireland is 12:00 AM in BST.Ireland observes daylight saving time while BST does not, so the gap narrows or widens by an hour part of the year.

Ireland to BST time conversion table

Ireland (IST)	BST (BST)	Day
12:00 AM	12:00 AM	same day
6:00 AM	6:00 AM	same day
7:00 AM	7:00 AM	same day
8:00 AM	8:00 AM	same day
9:00 AM	9:00 AM	same day
12:00 PM	12:00 PM	same day
3:00 PM	3:00 PM	same day
5:00 PM	5:00 PM	same day
6:00 PM	6:00 PM	same day
9:00 PM	9:00 PM	same day

Why people convert Ireland to BST time

Scheduling a call from Ireland to BST: a 10:00 AM start in Ireland lands at 10:00 AM in BST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Ireland and BST are inside the 9-to-5 working day between 9:00 AM and 5:00 PM IST time (9:00 AM–5:00 PM BST). That is roughly 8 hours of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Ireland is 8:00 PM in BST makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +0h gap is not.
Block 9:00 AM–5:00 PM IST as the recurring meeting window if you work primarily from Ireland and need BST colleagues present.
Ireland: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +0h gap.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

About BST (British Summer Time)

British Summer Time (BST) is the daylight saving period in the United Kingdom, when clocks move one hour forward from Greenwich Mean Time (GMT, UTC+00:00) to UTC+01:00. It runs from the last Sunday in March to the last Sunday in October. England, Scotland, Wales and Northern Ireland all follow it, along with the Isle of Man and the Channel Islands of Jersey and Guernsey. During BST, London is one hour ahead of UTC, four hours ahead of New York on Eastern Daylight Time, and five hours ahead of New York once the United States returns to Eastern Standard Time in November. BST is also used to abbreviate Bangladesh Standard Time (UTC+06:00), which is listed separately on this site.

Best time to call between Ireland and BST

Both Ireland and BST sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM IST, which is 9:00 AM–5:00 PM BST. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.

Business hours overlap

Ireland and BST share 8 hours of working-hours overlap (9:00 AM–5:00 PM IST), so scheduling a live meeting is straightforward.

Ireland is no time difference BST (IST UTC+01:00 → BST UTC+01:00). The shared working window is 9:00 AM–5:00 PM IST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Ireland

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

BST

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between Ireland and BST?

Ireland (IST, UTC+01:00) is no time difference BST (BST, UTC+01:00). The gap is currently +0h.

How do I convert Ireland time to BST time?

Add +0h to Ireland local time. For example, 9:00 AM in Ireland is 9:00 AM in BST.

What time is it in BST right now?

BST uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +0h offset from Ireland.

What is the best time to call BST from Ireland?

Call between 9:00 AM and 5:00 PM IST — that maps to 9:00 AM–5:00 PM BST and keeps both parties inside the working day.

Which is ahead, Ireland or BST?

Ireland and BST are currently on the same clock.

Do Ireland and BST use different time zones?

Ireland (Ireland) uses IST at UTC+01:00, while BST uses BST at UTC+01:00. The IANA identifiers are Europe/Dublin and Europe/London.

Does daylight saving time affect the Ireland–BST difference?

Yes at the moment: Ireland is on daylight saving time and BST is not, so the +0h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Ireland's time zone?

IST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use IST, Ireland's zone?

IST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

What is the time difference between Ireland and BST?

BST is +0h from Ireland.

What timezone is Ireland in?

Ireland operates on its local timezone.

What timezone is BST in?

BST operates on its local timezone.

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.