Ireland to Tokyo
+8hIreland
ISTSOURCETokyo
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
IST and JST on the World Map
The map below highlights the IST (Greenwich Mean Time) and JST (Japan Standard 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.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
About Tokyo
WikipediaTokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
The Tokyo subway system moves approximately 8.7 million passengers daily.
Everything You Need to Know About Ireland and Tokyo Time
Ireland runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts Ireland 8 hours ahead of Tokyo — a difference of +8h at the current offsets.
In practice, when it is 9:00 AM in Ireland it is 5:00 PM in Tokyo. Midnight in Ireland is 8:00 AM in Tokyo.Ireland observes daylight saving time while Tokyo does not, so the gap narrows or widens by an hour part of the year.
Ireland to Tokyo time conversion table
| Ireland (IST) | Tokyo (JST) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | same day |
| 6:00 AM | 2:00 PM | same day |
| 7:00 AM | 3:00 PM | same day |
| 8:00 AM | 4:00 PM | same day |
| 9:00 AM | 5:00 PM | same day |
| 12:00 PM | 8:00 PM | same day |
| 3:00 PM | 11:00 PM | same day |
| 5:00 PM | 1:00 AM | next day |
| 6:00 PM | 2:00 AM | next day |
| 9:00 PM | 5:00 AM | next day |
Why people convert Ireland to Tokyo time
- Scheduling a call from Ireland to Tokyo: a 10:00 AM start in Ireland lands at 6:00 PM in Tokyo, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +8h gap: Ireland and Tokyo have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Tokyo is 5:00 PM in Ireland.
- Watching a live event or market open: Ireland viewers need 5:00 PM in Tokyo to catch a 9:00 AM start there, and 4:00 PM if the event is anchored to Ireland.
- Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +8h gap is not.
- With a +8h gap there is no shared 9-to-5 window, so alternate the early start: one week Ireland takes the early slot, the next week Tokyo does.
- Ireland: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +8h 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 JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between Ireland and Tokyo
With a +8h offset there is no overlap inside a normal 9 AM – 5 PM day. Tokyo opens at 9:00 AM JST, which is 5:00 PM in Ireland, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Ireland and Tokyo have no shared working hours because of the +8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Ireland is 8 hours ahead of Tokyo (IST UTC+01:00 → JST UTC+09:00). There is no shared 9-to-5 window, so plan around an early or late slot. 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
Tokyo
Does not observe DST
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 Ireland and Tokyo?
Ireland (IST, UTC+01:00) is 8 hours ahead of Tokyo (JST, UTC+09:00). The gap is currently +8h.
How do I convert Ireland time to Tokyo time?
Add +8h to Ireland local time. For example, 9:00 AM in Ireland is 5:00 PM in Tokyo.
What time is it in Tokyo right now?
Tokyo uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +8h offset from Ireland.
What is the best time to call Tokyo from Ireland?
There is no shared working-hours window because of the +8h gap. The closest option is 1:00 PM in Ireland, which is 9:00 PM in Tokyo.
Which is ahead, Ireland or Tokyo?
Ireland is 8 hours ahead of Tokyo. When it is 12:00 PM in Ireland it is 8:00 PM in Tokyo.
Do Ireland and Tokyo use different time zones?
Ireland (Ireland) uses IST at UTC+01:00, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are Europe/Dublin and Asia/Tokyo.
Does daylight saving time affect the Ireland–Tokyo difference?
Yes at the moment: Ireland is on daylight saving time and Tokyo is not, so the +8h 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.
Is there a day difference between Ireland and Tokyo?
Not normally. The +8h gap only pushes the date over for late-evening times.
What is the time difference between Ireland and Tokyo?
Tokyo is +8h from Ireland.
What timezone is Ireland in?
Ireland operates on its local timezone.
What timezone is Tokyo in?
Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
What are the business hours in Tokyo?
Standard business hours in Tokyo are 9:00 AM - 6:00 PM JST.
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 JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in Ireland, what time is it in Tokyo?
When it is 12:00 AM (midnight) in Ireland (GMT), it is +8h later in Tokyo (JST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More Ireland time conversions
- ireland to dublin
- ireland to new york
- ireland to london
- ireland to dubai
- ireland to singapore
- ireland to sydney
- ireland to los angeles
- ireland to paris
- ireland to delhi
- ireland to mumbai
- ireland to berlin
- ireland to hong kong
- ireland to toronto
- ireland to kathmandu
- new york to ireland
- london to ireland
- dubai to ireland
- tokyo to ireland
- singapore to ireland
- sydney to ireland
- los angeles to ireland
- paris to ireland
- delhi to ireland
- mumbai to ireland
- berlin to ireland
- hong kong to ireland
- toronto to ireland
- kathmandu to ireland
See every conversion from Ireland →·See every conversion from Tokyo →