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.

IRST to NZST

+8h 30m

IRST

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

NZST

UTC+13:00☀ DST active

HH08

MM30

20:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IRST

NZST

12:00 AM

9:30 AM

2:00 AM

11:30 AM

4:00 AM

1:30 PM

6:00 AM

3:30 PM

8:00 AM

5:30 PM

10:00 AM

7:30 PM

12:00 PM

9:30 PM

2:00 PM

11:30 PM

4:00 PM

1:30 AM+1

6:00 PM

3:30 AM+1

8:00 PM

5:30 AM+1

10:00 PM

7:30 AM+1

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

IRST and NZST on the World Map

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

IRST Zone

→

NZST Zone

Explore all world timezones interactively →

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

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 to NZST Time Difference – Complete Guide

IRST runs on Iran Standard Time (IRST) at UTC+03:30. NZST runs on New Zealand Standard Time (NZST) at UTC+12:00. That puts IRST 8 hours 30 minutes ahead of NZST — a difference of +8h 30m at the current offsets.

In practice, when it is 9:00 AM in IRST it is 5:30 PM in NZST. Midnight in IRST is 8:30 AM in NZST. Neither zone observes daylight saving time, so the offset between them stays constant all year.

IRST to NZST time conversion table

IRST (IRST)	NZST (NZST)	Day
12:00 AM	8:30 AM	same day
6:00 AM	2:30 PM	same day
7:00 AM	3:30 PM	same day
8:00 AM	4:30 PM	same day
9:00 AM	5:30 PM	same day
12:00 PM	8:30 PM	same day
3:00 PM	11:30 PM	same day
5:00 PM	1:30 AM	next day
6:00 PM	2:30 AM	next day
9:00 PM	5:30 AM	next day

Why people convert IRST to NZST time

Scheduling a call from IRST to NZST: a 10:00 AM start in IRST lands at 6:30 PM in NZST, so you can confirm the slot without doing the arithmetic yourself.
Handling a +8h 30m gap: IRST 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 5:30 PM in IRST.
Coordinating a IRST-based team with NZST contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +8h 30m gap is not.
With a +8h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week IRST takes the early slot, the next week NZST does.

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.

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 IRST and NZST

With a +8h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. NZST opens at 9:00 AM NZST, which is 5:30 PM in IRST, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

IRST and NZST have no shared working hours because of the +8h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.

IRST is 8 hours 30 minutes ahead of NZST (IRST UTC+03:30 → 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

IRST

Does not observe DST

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 IRST and NZST?

IRST (IRST, UTC+03:30) is 8 hours 30 minutes ahead of NZST (NZST, UTC+12:00). The gap is currently +8h 30m.

How do I convert IRST time to NZST time?

Add +8h 30m to IRST local time. For example, 9:00 AM in IRST is 5:30 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 +8h 30m offset from IRST.