London to Ireland
+0hLondon
BSTSOURCEIreland
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and IST on the World Map
The map below highlights the BST (Greenwich Mean Time) and IST (Greenwich Mean Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •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.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •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.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
Comparing Time Zones: London and Ireland
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Ireland runs on Irish Standard Time (IST) at UTC+01:00, also currently on daylight saving time. That puts London no time difference Ireland — a difference of +0h at the current offsets.
In practice, when it is 9:00 AM in London it is 9:00 AM in Ireland. Midnight in London is 12:00 AM in Ireland. Because both zones shift for daylight saving, the gap between them only changes during the few weeks each year when their transition dates differ.
London to Ireland time conversion table
| London (BST) | Ireland (IST) | 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 London to Ireland time
- Scheduling a call from London to Ireland: a 10:00 AM start in London lands at 10:00 AM in Ireland, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both London and Ireland are inside the 9-to-5 working day between 9:00 AM and 5:00 PM BST time (9:00 AM–5:00 PM IST). That is roughly 8 hours of usable overlap.
- Watching a live event or market open: London viewers need 9:00 AM in Ireland to catch a 9:00 AM start there, and 12:00 AM if the event is anchored to London.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +0h gap is not.
- Block 9:00 AM–5:00 PM BST as the recurring meeting window if you work primarily from London and need Ireland colleagues present.
- London: 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.
- Ireland: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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 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.
Best time to call between London and Ireland
Both London and Ireland sit inside the 9 AM – 5 PM working day between 9:00 AM–5:00 PM BST, which is 9:00 AM–5:00 PM IST. That gives roughly 8 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
London and Ireland share 8 hours of working-hours overlap (9:00 AM–5:00 PM BST), so scheduling a live meeting is straightforward.
London is no time difference Ireland (BST UTC+01:00 → IST UTC+01:00). The shared working window is 9:00 AM–5:00 PM BST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Ireland
☀ 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:
Frequently Asked Questions
What is the time difference between London and Ireland?
London (BST, UTC+01:00) is no time difference Ireland (IST, UTC+01:00). The gap is currently +0h.
How do I convert London time to Ireland time?
Add +0h to London local time. For example, 9:00 AM in London is 9:00 AM in Ireland.
What time is it in Ireland right now?
Ireland uses IST 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 London.
What is the best time to call Ireland from London?
Call between 9:00 AM and 5:00 PM BST — that maps to 9:00 AM–5:00 PM IST and keeps both parties inside the working day.
Which is ahead, London or Ireland?
London and Ireland are currently on the same clock.
Do London and Ireland use different time zones?
London (UK) uses BST at UTC+01:00, while Ireland (Ireland) uses IST at UTC+01:00. The IANA identifiers are Europe/London and Europe/Dublin.
Does daylight saving time affect the London–Ireland difference?
Both zones observe DST, so the difference stays at +0h for most of the year and only changes during the weeks when their transition dates do not line up.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
What is the time difference between London and Ireland?
Ireland is +0h from London.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What timezone is Ireland in?
Ireland operates on its local timezone.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
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.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in London, what time is it in Ireland?
When it is 12:00 AM (midnight) in London (GMT), it is +0h later in Ireland (GMT).
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