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 NST

-4h 30m

Ireland

ISTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

NST

UTC-02:30☀ DST active

HH07

MM30

07:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Ireland

NST

12:00 AM

8:30 PM-1

2:00 AM

10:30 PM-1

4:00 AM

12:30 AM

6:00 AM

2:30 AM

8:00 AM

4:30 AM

10:00 AM

6:30 AM

12:00 PM

8:30 AM

2:00 PM

10:30 AM

4:00 PM

12:30 PM

6:00 PM

2:30 PM

8:00 PM

4:30 PM

10:00 PM

6:30 PM

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

IST and NST on the World Map

The map below highlights the IST (Greenwich Mean Time) and NST (Newfoundland Standard Time) timezone regions across the globe.

IST Zone

→

NST 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

NST – Newfoundland Standard Time

UTC-03:30

Newfoundland Standard Time (NST) is a unique half-hour offset time zone in Canada, 3.5 hours behind UTC.

Countries in NST

Canada (Newfoundland)

Major Cities in NST

St. John'sCorner BrookMount Pearl

Key Facts about NST

•NST is one of only a few half-hour offset time zones in the world.
•Newfoundland joined Canada in 1949 and kept its unique time zone.
•St. John's is the easternmost city in North America.

Daylight Saving:Yes – switches to NDT

Learn more about NST on Wikipedia

Time Conversion Guide: Ireland to NST

Ireland runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. NST runs on Newfoundland Standard Time (NST) at UTC-03:30. That puts Ireland 4 hours 30 minutes behind NST — a difference of -4h 30m at the current offsets.

In practice, when it is 9:00 AM in Ireland it is 4:30 AM in NST. Midnight in Ireland is 7:30 PM in NST.Ireland observes daylight saving time while NST does not, so the gap narrows or widens by an hour part of the year.

Ireland to NST time conversion table

Ireland (IST)	NST (NST)	Day
12:00 AM	7:30 PM	previous day
6:00 AM	1:30 AM	same day
7:00 AM	2:30 AM	same day
8:00 AM	3:30 AM	same day
9:00 AM	4:30 AM	same day
12:00 PM	7:30 AM	same day
3:00 PM	10:30 AM	same day
5:00 PM	12:30 PM	same day
6:00 PM	1:30 PM	same day
9:00 PM	4:30 PM	same day

Why people convert Ireland to NST time

Scheduling a call from Ireland to NST: a 10:00 AM start in Ireland lands at 5:30 AM in NST, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Ireland and NST are inside the 9-to-5 working day between 1:30 PM and 5:00 PM IST time (9:00 AM–12:30 PM NST). That is roughly 3 hours 30 minutes of usable overlap.
Booking travel or deliveries: tracking NST local time against Ireland keeps pickup windows and arrival estimates honest across the -4h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -4h 30m gap is not.
Block 1:30 PM–5:00 PM IST as the recurring meeting window if you work primarily from Ireland and need NST 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 -4h 30m 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 NST (Newfoundland Standard Time)

Newfoundland Standard Time (NST) is one of the few half-hour offset time zones in the world. It covers the island of Newfoundland in Canada and is 30 minutes ahead of Atlantic Standard Time. This unique offset exists because Newfoundland was an independent country until 1949.

Best time to call between Ireland and NST

Both Ireland and NST sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM IST, which is 9:00 AM–12:30 PM NST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Ireland and NST overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Ireland is 4 hours 30 minutes behind NST (IST UTC+01:00 → NST UTC-03:30). The shared working window is 1:30 PM–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

NST

☀ Currently in DST

Standard: UTC-03:30 · DST: UTC-02:30

Clocks fall back on Sun, Nov 1, 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 NST?

Ireland (IST, UTC+01:00) is 4 hours 30 minutes behind NST (NST, UTC-03:30). The gap is currently -4h 30m.

How do I convert Ireland time to NST time?

Add -4h 30m to Ireland local time. For example, 9:00 AM in Ireland is 4:30 AM in NST.

What time is it in NST right now?

NST uses NST at UTC-03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -4h 30m offset from Ireland.

What is the best time to call NST from Ireland?

Call between 1:30 PM and 5:00 PM IST — that maps to 9:00 AM–12:30 PM NST and keeps both parties inside the working day.

Which is behind, Ireland or NST?

Ireland is 4 hours 30 minutes behind NST. When it is 12:00 PM in Ireland it is 7:30 AM in NST.

Do Ireland and NST use different time zones?

Ireland (Ireland) uses IST at UTC+01:00, while NST uses NST at UTC-03:30. The IANA identifiers are Europe/Dublin and America/St_Johns.

Does daylight saving time affect the Ireland–NST difference?

Yes at the moment: Ireland is on daylight saving time and NST is not, so the -4h 30m 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 NST?

Not normally. The -4h 30m gap only pushes the date over the previous day.

What is the time difference between Ireland and NST?

NST is -4h 30m from Ireland.

What timezone is Ireland in?

Ireland operates on its local timezone.

What timezone is NST in?

NST 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.