Observatory log
Tehran and Hong Kong, compared
- 01Difference now
Hong Kong is 4 hours 30 minutes ahead of Tehran.
Tehran: UTC+3:30 (UTC+3:30) · Hong Kong: HKT (UTC+8)
- 02Through 2026–2027
The difference stays the same all year.
- 1 January 2026 – 31 December 2027+4 h 30 min
Difference of Hong Kong from Tehran. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
- Mon–Thu: 09:00–12:30 in Tehran = 13:30–17:00 in Hong Kong · 3 h 30 min
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
09:00–12:30 in Tehran = 13:30–17:00 in Hong Kong
Inside both working days (Mon–Thu).
- 05Weekend
Tehran: Friday
Hong Kong: Saturday and Sunday
24 hours
A day in Tehran, in Hong Kong
| Tehran | Hong Kong | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 04:30 | |
| 01:00 | 05:30 | |
| 02:00 | 06:30 | |
| 03:00 | 07:30 | |
| 04:00 | 08:30 | |
| 05:00 | 09:30 | |
| 06:00 | 10:30 | |
| 07:00 | 11:30 | |
| 08:00 | 12:30 | |
| 09:00 | 13:30 | |
| 10:00 | 14:30 | |
| 11:00 | 15:30 | |
| 12:00 | 16:30 | |
| 13:00 | 17:30 | |
| 14:00 | 18:30 | |
| 15:00 | 19:30 | |
| 16:00 | 20:30 | |
| 17:00 | 21:30 | |
| 18:00 | 22:30 | |
| 19:00 | 23:30 | |
| 20:00 | 00:30Tomorrow | |
| 21:00 | 01:30Tomorrow | |
| 22:00 | 02:30Tomorrow | |
| 23:00 | 03:30Tomorrow |
Working hoursEarly or eveningNightWeekend
Questions
Asked about Tehran and Hong Kong
What is the time difference between Tehran and Hong Kong?
Hong Kong is 4 hours 30 minutes ahead of Tehran. The difference stays the same all year.
What is the best time for a call between Tehran and Hong Kong?
Inside both working days: Mon–Thu: 09:00–12:30 in Tehran = 13:30–17:00 in Hong Kong · 3 h 30 min.
When does the time difference between Tehran and Hong Kong change?
It does not change in the next 12 months: Tehran and Hong Kong either keep the same time all year or change their clocks on the same dates.