Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

NZDT to Tehran

-9h 30m

NZDT

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

NZDT

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 Daylight Time) and IRST (Iran Standard Time) timezone regions across the globe.

NZDT Zone

→

IRST Zone

Explore all world timezones interactively →

NZDT – New Zealand Daylight Time

UTC+13:00

New Zealand Daylight Time (NZDT, UTC+13:00) is New Zealand's summer time zone, one of the earliest offsets in the world.

Countries in NZDT

New Zealand

Major Cities in NZDT

AucklandWellingtonChristchurchHamiltonDunedin

Key Facts about NZDT

•NZDT runs from the last Sunday in September to the first Sunday in April.
•NZDT is UTC+13:00 — one of the earliest time offsets used anywhere.
•New Zealand changes its clocks two to three weeks before Australia.
•The Chatham Islands observe UTC+13:45 during their summer time.

Daylight Saving:Yes – switches to NZDT

Learn more about NZDT 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 →

NZDT vs Tehran: Offsets, DST and Best Call Times

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

In practice, when it is 9:00 AM in NZDT it is 11:30 PM in Tehran on the previous day. Midnight in NZDT is 2:30 PM in Tehran. Neither zone observes daylight saving time, so the offset between them stays constant all year.

NZDT to Tehran time conversion table

NZDT (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 NZDT to Tehran time

Scheduling a call from NZDT to Tehran: a 10:00 AM start in NZDT lands at 12:30 AM in Tehran, so you can confirm the slot without doing the arithmetic yourself.
Handling a -9h 30m gap: NZDT 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 NZDT.
Watching a live event or market open: NZDT 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 NZDT.

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 NZDT takes the early slot, the next week Tehran does.

About NZDT (New Zealand Daylight Time)

New Zealand Daylight Time (NZDT) is the summer time zone for New Zealand, one hour ahead of New Zealand Standard Time (NZST, UTC+12:00). It runs from the last Sunday in September to the first Sunday in April, so New Zealand shifts a week or two earlier in spring than Australia. At UTC+13:00, NZDT is among the earliest offsets in the world — only Samoa, Tonga and parts of Kiribati run further ahead at certain times of year. Auckland and Wellington are 13 hours ahead of UTC during NZDT, 12 hours ahead of Sydney, and 18 hours ahead of New York. The Chatham Islands, 45 minutes further east, move to UTC+13:45.

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 NZDT 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 NZDT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

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

NZDT 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

NZDT

☀ 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 NZDT and Tehran?

NZDT (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 NZDT time to Tehran time?

Add -9h 30m to NZDT local time. For example, 9:00 AM in NZDT 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 NZDT.

What is the best time to call Tehran from NZDT?

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

Which is behind, NZDT or Tehran?

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

Do NZDT and Tehran use different time zones?

NZDT 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 NZDT–Tehran difference?

Neither zone observes daylight saving time, so the -9h 30m offset between NZDT and Tehran is fixed all year.

Which other cities share NZDT's time zone?

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

Which countries use NZDT, NZDT's zone?

NZDT is used in New Zealand.

Is there a day difference between NZDT and Tehran?

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

What is the time difference between NZDT and Tehran?

Tehran is -9h 30m from NZDT.

What timezone is NZDT in?

NZDT 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.