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.

Auckland to IRST

-9h 30m

Auckland

NZDTSOURCE

New Zealand · UTC+13:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

IRST

UTC+03:30

HH02

MM30

02:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Auckland

IRST

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 Auckland

Wikipedia

Auckland operates on New Zealand Standard Time (NZST), UTC+12. As the first major city to see each day, Auckland opens global business ahead of all other markets.

Population:1.7 million

Metro:1.7 million

Business Hours:9:00 AM - 5:00 PM NZST

Currency:NZD (NZ$)

Stock Exchange:NZX (New Zealand Exchange)

Key Landmarks

Sky TowerAuckland Harbour BridgeAuckland War Memorial MuseumWaiheke IslandRangitoto Island

Did You Know?

Auckland is the first major city to see the sunrise each day (along with cities further east).

Learn more about NZDT timezone →

Comparing Time Zones: Auckland and IRST

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

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

Auckland to IRST time conversion table

Auckland (NZDT)	IRST (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 Auckland to IRST time

Scheduling a call from Auckland to IRST: a 10:00 AM start in Auckland lands at 12:30 AM in IRST, so you can confirm the slot without doing the arithmetic yourself.
Handling a -9h 30m gap: Auckland and IRST 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 IRST is 11:30 PM in Auckland.
Booking travel or deliveries: tracking IRST local time against Auckland keeps pickup windows and arrival estimates honest across the -9h 30m offset.

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 Auckland takes the early slot, the next week IRST does.
Auckland: 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 Auckland and IRST

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

Business hours overlap

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

Auckland is 9 hours 30 minutes behind IRST (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

Auckland

☀ Currently in DST

Standard: UTC+12:00 · DST: UTC+13:00

Clocks fall back on Sat, Apr 3, 2027

IRST

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 Auckland and IRST?

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

How do I convert Auckland time to IRST time?

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

What time is it in IRST right now?

IRST 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 Auckland.

What is the best time to call IRST from Auckland?

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

Which is behind, Auckland or IRST?

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

Do Auckland and IRST use different time zones?

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

Does daylight saving time affect the Auckland–IRST difference?

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

Which other cities share Auckland's time zone?

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

Which countries use NZDT, Auckland's zone?

NZDT is used in New Zealand.

Is there a day difference between Auckland and IRST?

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

What is the time difference between Auckland and IRST?

IRST is -9h 30m from Auckland.

What timezone is Auckland in?

Auckland operates on New Zealand Standard Time (NZST), UTC+12. As the first major city to see each day, Auckland opens global business ahead of all other markets.