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 NZST

+11h

Ireland

ISTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

NZST

UTC+13:00☀ DST active

HH11

MM00

23:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Ireland

NZST

12:00 AM

12:00 PM

2:00 AM

2:00 PM

4:00 AM

4:00 PM

6:00 AM

6:00 PM

8:00 AM

8:00 PM

10:00 AM

10:00 PM

12:00 PM

12:00 AM+1

2:00 PM

2:00 AM+1

4:00 PM

4:00 AM+1

6:00 PM

6:00 AM+1

8:00 PM

8:00 AM+1

10:00 PM

10:00 AM+1

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

IST and NZST on the World Map

The map below highlights the IST (Greenwich Mean Time) and NZST (New Zealand Standard Time) timezone regions across the globe.

IST Zone

→

NZST 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

NZST – New Zealand Standard Time

UTC+12:00

New Zealand Standard Time (NZST) is the time zone for New Zealand, 12 hours ahead of UTC.

Countries in NZST

New Zealand

Major Cities in NZST

AucklandWellingtonChristchurchHamiltonDunedin

Key Facts about NZST

•New Zealand is among the first major countries to see a new day.
•NZST is 17 hours ahead of EST.
•New Zealand observes DST from September to April (Southern Hemisphere summer).

Daylight Saving:Yes – switches to NZDT

Learn more about NZST on Wikipedia

Ireland vs NZST: Offsets, DST and Best Call Times

Ireland runs on Irish Standard Time (IST) at UTC+01:00, currently observing daylight saving time. NZST runs on New Zealand Standard Time (NZST) at UTC+12:00. That puts Ireland 11 hours ahead of NZST — a difference of +11h at the current offsets.

In practice, when it is 9:00 AM in Ireland it is 8:00 PM in NZST. Midnight in Ireland is 11:00 AM in NZST.Ireland observes daylight saving time while NZST does not, so the gap narrows or widens by an hour part of the year.

Ireland to NZST time conversion table

Ireland (IST)	NZST (NZST)	Day
12:00 AM	11:00 AM	same day
6:00 AM	5:00 PM	same day
7:00 AM	6:00 PM	same day
8:00 AM	7:00 PM	same day
9:00 AM	8:00 PM	same day
12:00 PM	11:00 PM	same day
3:00 PM	2:00 AM	next day
5:00 PM	4:00 AM	next day
6:00 PM	5:00 AM	next day
9:00 PM	8:00 AM	next day

Why people convert Ireland to NZST time

Scheduling a call from Ireland to NZST: a 10:00 AM start in Ireland lands at 9:00 PM in NZST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +11h gap: Ireland and NZST 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 NZST is 8:00 PM in Ireland.
Booking travel or deliveries: tracking NZST local time against Ireland keeps pickup windows and arrival estimates honest across the +11h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a +11h gap is not.
With a +11h gap there is no shared 9-to-5 window, so alternate the early start: one week Ireland takes the early slot, the next week NZST 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 +11h 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 NZST (New Zealand Standard Time)

New Zealand Standard Time (NZST) is the standard time zone for New Zealand and its dependencies. New Zealand is among the first countries to see a new calendar day. During summer (September to April), clocks advance to New Zealand Daylight Time (NZDT, UTC+13:00).

Best time to call between Ireland and NZST

With a +11h offset there is no overlap inside a normal 9 AM – 5 PM day. NZST opens at 9:00 AM NZST, which is 8:00 PM in Ireland, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Ireland and NZST have no shared working hours because of the +11h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Ireland is 11 hours ahead of NZST (IST UTC+01:00 → NZST UTC+12:00). 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

NZST

☀ Currently in DST

Standard: UTC+12:00 · DST: UTC+13:00

Clocks fall back on Sat, Apr 3, 2027

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 NZST?

Ireland (IST, UTC+01:00) is 11 hours ahead of NZST (NZST, UTC+12:00). The gap is currently +11h.

How do I convert Ireland time to NZST time?

Add +11h to Ireland local time. For example, 9:00 AM in Ireland is 8:00 PM in NZST.

What time is it in NZST right now?

NZST uses NZST at UTC+12:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +11h offset from Ireland.

What is the best time to call NZST from Ireland?

There is no shared working-hours window because of the +11h gap. The closest option is 1:00 PM in Ireland, which is 12:00 AM in NZST.

Which is ahead, Ireland or NZST?

Ireland is 11 hours ahead of NZST. When it is 12:00 PM in Ireland it is 11:00 PM in NZST.

Do Ireland and NZST use different time zones?

Ireland (Ireland) uses IST at UTC+01:00, while NZST uses NZST at UTC+12:00. The IANA identifiers are Europe/Dublin and Pacific/Auckland.

Does daylight saving time affect the Ireland–NZST difference?

Yes at the moment: Ireland is on daylight saving time and NZST is not, so the +11h 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 NZST?

Not normally. The +11h gap only pushes the date over for late-evening times.

What is the time difference between Ireland and NZST?

NZST is +11h from Ireland.

What timezone is Ireland in?

Ireland operates on its local timezone.

What timezone is NZST in?

NZST 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.