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.

Iran to HKT

+4h 30m

Iran

IRSTSOURCE

UTC+03:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

HKT

UTC+08:00

HH04

MM30

16:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Iran

HKT

12:00 AM

4:30 AM

2:00 AM

6:30 AM

4:00 AM

8:30 AM

6:00 AM

10:30 AM

8:00 AM

12:30 PM

10:00 AM

2:30 PM

12:00 PM

4:30 PM

2:00 PM

6:30 PM

4:00 PM

8:30 PM

6:00 PM

10:30 PM

8:00 PM

12:30 AM+1

10:00 PM

2:30 AM+1

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

IRST and HKT on the World Map

The map below highlights the IRST (Iran Standard Time) and HKT (Hong Kong Time) timezone regions across the globe.

IRST Zone

→

HKT 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

HKT – Hong Kong Time

UTC+08:00

Hong Kong Time (HKT, UTC+08:00) is the time zone for Hong Kong, 8 hours ahead of UTC.

Countries in HKT

Hong Kong SAR

Major Cities in HKT

Hong KongKowloonTsuen WanSha Tin

Key Facts about HKT

•Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979.
•HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.
•The Hong Kong Stock Exchange opens at 09:30 HKT.
•Hong Kong Time does not change with the seasons, so its gap to other zones is fixed.

Daylight Saving:No – UTC+08:00 year-round

Learn more about HKT on Wikipedia

Iran to HKT Time Difference – Complete Guide

Iran runs on Iran Standard Time (IRST) at UTC+03:30. HKT runs on Hong Kong Time (HKT) at UTC+08:00. That puts Iran 4 hours 30 minutes ahead of HKT — a difference of +4h 30m at the current offsets.

In practice, when it is 9:00 AM in Iran it is 1:30 PM in HKT. Midnight in Iran is 4:30 AM in HKT. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Iran to HKT time conversion table

Iran (IRST)	HKT (HKT)	Day
12:00 AM	4:30 AM	same day
6:00 AM	10:30 AM	same day
7:00 AM	11:30 AM	same day
8:00 AM	12:30 PM	same day
9:00 AM	1:30 PM	same day
12:00 PM	4:30 PM	same day
3:00 PM	7:30 PM	same day
5:00 PM	9:30 PM	same day
6:00 PM	10:30 PM	same day
9:00 PM	1:30 AM	next day

Why people convert Iran to HKT time

Scheduling a call from Iran to HKT: a 10:00 AM start in Iran lands at 2:30 PM in HKT, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Iran and HKT are inside the 9-to-5 working day between 9:00 AM and 12:30 PM IRST time (1:30 PM–5:00 PM HKT). That is roughly 3 hours 30 minutes of usable overlap.
Booking travel or deliveries: tracking HKT local time against Iran keeps pickup windows and arrival estimates honest across the +4h 30m offset.

Always state the zone abbreviation, not just the hour. "3:00 PM IRST" is unambiguous; "3 PM" across a +4h 30m gap is not.
Block 9:00 AM–12:30 PM IRST as the recurring meeting window if you work primarily from Iran and need HKT colleagues present.

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 HKT (Hong Kong Time)

Hong Kong Time (HKT) is fixed at UTC+08:00 all year and does not observe daylight saving time. Hong Kong last used summer time in 1979 and has kept a single offset since. HKT shares the UTC+08:00 offset with China Standard Time, Singapore Time, Malaysian Time, Philippine Time and Australian Western Standard Time, but is listed separately because Hong Kong maintains its own timekeeping authority. As a major financial centre, Hong Kong's trading hours set the rhythm for markets across Asia, opening at 09:30 HKT which is 01:30 in London and 20:30 the previous evening in New York.

Best time to call between Iran and HKT

Both Iran and HKT sit inside the 9 AM – 5 PM working day between 9:00 AM–12:30 PM IRST, which is 1:30 PM–5:00 PM HKT. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Iran and HKT overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Iran is 4 hours 30 minutes ahead of HKT (IRST UTC+03:30 → HKT UTC+08:00). The shared working window is 9:00 AM–12:30 PM IRST. Remember to re-check around daylight-saving transitions.

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 Iran and HKT?

Iran (IRST, UTC+03:30) is 4 hours 30 minutes ahead of HKT (HKT, UTC+08:00). The gap is currently +4h 30m.

How do I convert Iran time to HKT time?

Add +4h 30m to Iran local time. For example, 9:00 AM in Iran is 1:30 PM in HKT.

What time is it in HKT right now?

HKT uses HKT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h 30m offset from Iran.

What is the best time to call HKT from Iran?

Call between 9:00 AM and 12:30 PM IRST — that maps to 1:30 PM–5:00 PM HKT and keeps both parties inside the working day.

Which is ahead, Iran or HKT?

Iran is 4 hours 30 minutes ahead of HKT. When it is 12:00 PM in Iran it is 4:30 PM in HKT.

Do Iran and HKT use different time zones?

Iran (Iran) uses IRST at UTC+03:30, while HKT uses HKT at UTC+08:00. The IANA identifiers are Asia/Tehran and Asia/Hong_Kong.

Does daylight saving time affect the Iran–HKT difference?

Neither zone observes daylight saving time, so the +4h 30m offset between Iran and HKT is fixed all year.

Which other cities share Iran's time zone?

IRST also covers Tehran, Isfahan, Mashhad, Tabriz, Shiraz, Karaj.

Which countries use IRST, Iran's zone?

IRST is used in Iran.

Is there a day difference between Iran and HKT?

Not normally. The +4h 30m gap only pushes the date over for late-evening times.

What is the time difference between Iran and HKT?

HKT is +4h 30m from Iran.

What timezone is Iran in?

Iran operates on its local timezone.

What timezone is HKT in?

HKT operates on its local timezone.

Which countries use IRST (Iran Standard Time)?

IRST is used in Iran.

Does IRST observe daylight saving time?

Yes, IRST switches to IRDT during summer months.

What are some interesting 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).

Which cities are in the HKT timezone?

Major cities in the HKT timezone include Hong Kong, Kowloon, Tsuen Wan, Sha Tin.

What is the UTC offset for HKT?

Hong Kong Time (HKT) is at UTC+08:00.

What should I know about the HKT timezone?

Hong Kong does not observe daylight saving time and has kept UTC+08:00 since 1979. HKT shares its offset with China Standard Time, Singapore Time and Philippine Time.