Does Hong Kong observe daylight saving time?

No. Hong Kong stays on HKT (UTC+8) all year, so its clocks don't change.

Does Tehran observe daylight saving time?

No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.

What time is it in Tehran when it's 9 AM in Hong Kong?

4:30 AM in Tehran, on the same day.

Hong Kong to Tehran Meeting Planner

Tehran is 4 hours 30 minutes behind Hong Kong right now. Their working days overlap for 3 hours 30 minutes today.

Hong Kong · China

11:34 AM

Sun, Oct 18 · HKT

Tehran · Iran

7:04 AM

Sun, Oct 18 · IRST

Best Meeting Times Between Hong Kong and Tehran

1:30 PM to 5:00 PM in Hong Kong (9:00 AM to 12:30 PM in Tehran). That's when both cities are inside working hours, 9 AM to 5 PM, giving 3 hours 30 minutes of overlap today.

Who's meeting

2 of 4 places

Hong KongOrganizerChina ·11:34AMnow
TehranIran ·7:04AMnow

Add a city

Add up to 4 places by city, country, time zone or abbreviation, like Tokyo, India or JST. Press "/" to jump here.

Date in Hong Kong

Working hours, everywhere

Best times to meet

Sunday, October 18, 2026, in Hong Kong time.

1:30PMBest · OptimalWorking hours in Hong Kong (13:30) and Tehran (09:00).
2:00PMOption 2 · OptimalWorking hours in Hong Kong (14:00) and Tehran (09:30).
2:30PMOption 3 · OptimalWorking hours in Hong Kong (14:30) and Tehran (10:00).

The whole day

Pick any slot in the Fit row, or use the arrow keys there, to make it the meeting time.

Each column is a half hour of the first place's day. The Fit row grades how well the slot suits everyone; each row shows the local time and whether it's working hours there.
Fit
Hong KongUTC+8
TehranUTC+3:30
UTC	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15

Working hours (09–17)Just outside (07–09, 17–20)Late evening (20–23)NightFit: optimal, good, possible, poor

Your meeting

Hong Kong1:30 PM UTC+8Sun, Oct 18
Tehran9:00 AM UTC+3:30Sun, Oct 18
UTC2026-10-18 05:30 UTC

What will it cost? Try the meeting cost calculator.

Time difference between Hong Kong and Tehran

Tehran is 4 hours 30 minutes behind Hong Kong right now: Tehran is on IRST (UTC+3:30) and Hong Kong on HKT (UTC+8). Neither city changes its clocks, so the gap is the same all year.

Time difference between Hong Kong and Tehran over the next 12 months
From	Difference	Why
Now	Tehran 4 hours 30 minutes behind	—

Hong Kong is on Hong Kong Standard Time. Tehran is on Iran Standard Time.

Frequently Asked Questions: Hong Kong & Tehran Scheduling

What is the time difference between Hong Kong and Tehran?: Tehran is 4 hours 30 minutes behind Hong Kong right now: Tehran is on IRST (UTC+3:30) and Hong Kong on HKT (UTC+8). Neither city changes its clocks, so the gap is the same all year.
What is the best time to schedule a meeting between Hong Kong and Tehran?: 1:30 PM to 5:00 PM in Hong Kong (9:00 AM to 12:30 PM in Tehran). That's when both cities are inside working hours, 9 AM to 5 PM, giving 3 hours 30 minutes of overlap today.
Does Hong Kong observe daylight saving time?: No. Hong Kong stays on HKT (UTC+8) all year, so its clocks don't change.
Does Tehran observe daylight saving time?: No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.
What time is it in Tehran when it's 9 AM in Hong Kong?: 4:30 AM in Tehran, on the same day.

Or see every city pair, or plan with more places in the meeting planner.