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).

New Zealand to Tehran

-9h 30m

New Zealand

NZDTSOURCE

UTC+13:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tehran

IRST

Iran · UTC+03:30

HH02

MM30

02:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

New Zealand

Tehran

12:00 AM

2:30 PM-1

2:00 AM

4:30 PM-1

4:00 AM

6:30 PM-1

6:00 AM

8:30 PM-1

8:00 AM

10:30 PM-1

10:00 AM

12:30 AM

12:00 PM

2:30 AM

2:00 PM

4:30 AM

4:00 PM

6:30 AM

6:00 PM

8:30 AM

8:00 PM

10:30 AM

10:00 PM

12:30 PM

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

NZDT and IRST on the World Map

The map below highlights the NZDT (New Zealand Standard Time) and IRST (Iran Standard Time) timezone regions across the globe.

NZDT Zone

→

IRST Zone

Explore all world timezones interactively →

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

IRST – Iran Standard Time

UTC+03:30

Iran Standard Time (IRST) is the time zone for Iran, 3 hours and 30 minutes ahead of UTC.

Countries in IRST

Iran

Major Cities in IRST

TehranIsfahanMashhadTabrizShirazKaraj

Key Facts about IRST

•IRST is one of only a few time zones with a 30-minute offset.
•Iran observes daylight saving time, switching to IRDT (UTC+04:30).
•Tehran has a metropolitan population of over 16 million.

Daylight Saving:Yes – switches to IRDT

Learn more about IRST on Wikipedia

About Tehran

Wikipedia

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.

Population:9.4 million

Metro:16.8 million

Business Hours:8:00 AM - 4:00 PM IRST

Currency:IRR (﷼)

Stock Exchange:TSE (Tehran Stock Exchange)

Key Landmarks

Azadi TowerGolestan PalaceGrand BazaarMilad TowerTabiat Bridge

Did You Know?

Iran Standard Time (IRST) is one of few timezones with a 30-minute offset (UTC+3:30).

Learn more about IRST timezone →

Understanding the -9h 30m Gap: New Zealand vs Tehran

New Zealand runs on New Zealand Daylight Time (NZDT) at UTC+13:00, currently observing daylight saving time. Tehran runs on Iran Standard Time (IRST) at UTC+03:30. That puts New Zealand 9 hours 30 minutes behind Tehran — a difference of -9h 30m at the current offsets.

In practice, when it is 9:00 AM in New Zealand it is 11:30 PM in Tehran on the previous day. Midnight in New Zealand is 2:30 PM in Tehran.New Zealand observes daylight saving time while Tehran does not, so the gap narrows or widens by an hour part of the year.

New Zealand to Tehran time conversion table

New Zealand (NZDT)	Tehran (IRST)	Day
12:00 AM	2:30 PM	previous day
6:00 AM	8:30 PM	previous day
7:00 AM	9:30 PM	previous day
8:00 AM	10:30 PM	previous day
9:00 AM	11:30 PM	previous day
12:00 PM	2:30 AM	same day
3:00 PM	5:30 AM	same day
5:00 PM	7:30 AM	same day
6:00 PM	8:30 AM	same day
9:00 PM	11:30 AM	same day

Why people convert New Zealand to Tehran time

Scheduling a call from New Zealand to Tehran: a 10:00 AM start in New Zealand lands at 12:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Handling a -9h 30m gap: New Zealand and Tehran 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 Tehran is 11:30 PM in New Zealand.
Watching a live event or market open: New Zealand viewers need 11:30 PM in Tehran to catch a 9:00 AM start there, and 9:30 AM if the event is anchored to New Zealand.

Always state the zone abbreviation, not just the hour. "3:00 PM NZDT" is unambiguous; "3 PM" across a -9h 30m gap is not.
With a -9h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week New Zealand takes the early slot, the next week Tehran does.
New Zealand: Clocks fall back on Sat, Apr 3, 2027. Re-check this page after that date because the offset changes and so does the -9h 30m gap.

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).

About IRST (Iran Standard Time)

Iran Standard Time (IRST) is one of the few time zones with a 30-minute offset. Iran observes daylight saving time (IRDT, UTC+04:30) from late March to late September. Tehran, the capital, is one of the largest cities in the Middle East.

Best time to call between New Zealand and Tehran

With a -9h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Tehran opens at 9:00 AM IRST, which is 11:30 PM in New Zealand, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

New Zealand and Tehran have no shared working hours because of the -9h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

New Zealand is 9 hours 30 minutes behind Tehran (NZDT UTC+13:00 → IRST UTC+03:30). 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

New Zealand

☀ Currently in DST

Standard: UTC+12:00 · DST: UTC+13:00

Clocks fall back on Sat, Apr 3, 2027

Tehran

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:

⏳

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 New Zealand and Tehran?

New Zealand (NZDT, UTC+13:00) is 9 hours 30 minutes behind Tehran (IRST, UTC+03:30). The gap is currently -9h 30m.

How do I convert New Zealand time to Tehran time?

Add -9h 30m to New Zealand local time. For example, 9:00 AM in New Zealand is 11:30 PM in Tehran (previous day).

What time is it in Tehran right now?

Tehran uses IRST at UTC+03:30. Use the live converter at the top of this page — it updates in real time and already accounts for the -9h 30m offset from New Zealand.

What is the best time to call Tehran from New Zealand?

There is no shared working-hours window because of the -9h 30m gap. The closest option is 1:00 PM in New Zealand, which is 3:30 AM in Tehran.

Which is behind, New Zealand or Tehran?

New Zealand is 9 hours 30 minutes behind Tehran. When it is 12:00 PM in New Zealand it is 2:30 AM in Tehran.

Do New Zealand and Tehran use different time zones?

New Zealand (New Zealand) uses NZDT at UTC+13:00, while Tehran (Iran) uses IRST at UTC+03:30. The IANA identifiers are Pacific/Auckland and Asia/Tehran.

Does daylight saving time affect the New Zealand–Tehran difference?

Yes at the moment: New Zealand is on daylight saving time and Tehran is not, so the -9h 30m gap shifts by an hour when exactly one of them changes clocks.

Which other cities share New Zealand's time zone?

NZDT also covers Auckland, Wellington, Christchurch, Hamilton, Dunedin.

Which countries use NZDT, New Zealand's zone?

NZDT is used in New Zealand.

Is there a day difference between New Zealand and Tehran?

Not normally. The -9h 30m gap only pushes the date over the previous day.

What is the time difference between New Zealand and Tehran?

Tehran is -9h 30m from New Zealand.

What timezone is New Zealand in?

New Zealand operates on its local timezone.

What timezone is Tehran in?

Tehran operates on Iran Standard Time (IRST), UTC+3:30. Iran's unique half-hour offset makes Tehran time distinctive for regional business coordination.