When it is 09:00 in Hong Kong it is 10:00 in Seoul in January and 10:00 in July. Seoul is 1 hour ahead Hong Kong right now — and the difference is the same all year. This page gives the live times in both cities, the overlap between their working days, the daylight saving dates that move the difference, and the best meeting windows.
Try the tool: Time Zone Converter — convert any time between Hong Kong and Seoul, with the offset for the date you pick.
Live times in Hong Kong and Seoul
The two cities side by side. The January column uses the winter offsets (Hong Kong UTC+08:00, Seoul UTC+09:00); the July column uses the summer offsets (Hong Kong UTC+08:00, Seoul UTC+09:00).
| Time in Hong Kong | Seoul in January | Seoul in July |
|---|---|---|
| 00:00 | 01:00 | 01:00 |
| 06:00 | 07:00 | 07:00 |
| 09:00 | 10:00 | 10:00 |
| 12:00 | 13:00 | 13:00 |
| 15:00 | 16:00 | 16:00 |
| 17:00 | 18:00 | 18:00 |
| 21:00 | 22:00 | 22:00 |
The world clock shows the current time in both cities live, and the individual city pages — time in Hong Kong and time in Seoul — explain each city's time zone, offsets and daylight saving in full.
The time difference between Hong Kong and Seoul
The difference is constant: Seoul is 1 hour ahead Hong Kong on every day of the year. That is the simplest case in time-zone work — the answer does not depend on the date, and a meeting set for 09:00 in Hong Kong is always 10:00 in Seoul. The reason the difference never changes is that neither city observes daylight saving.
To convert a time, add the difference: 09:00 in Hong Kong is 10:00 in Seoul in January and 10:00 in July; 17:00 in Hong Kong — the end of the working day — is 18:00 in Seoul in January and 18:00 in July. To go the other way, subtract it: 09:00 in Seoul is 08:00 in Hong Kong in January. The time difference calculator does the arithmetic for any date, and the UTC to Seoul page gives the full conversion table for Seoul.
Meeting overlap between Hong Kong and Seoul
The overlap is the hours when both cities are in their working day (09:00–17:00 local time). The table marks the overlapping hours in Hong Kong's working day and shows what time they are in Seoul.
January
| Hong Kong time | Seoul time | Both working? |
|---|---|---|
| 09:00 | 10:00 | No |
| 10:00 | 11:00 | No |
| 11:00 | 12:00 | No |
| 12:00 | 13:00 | No |
| 13:00 | 14:00 | No |
| 14:00 | 15:00 | No |
| 15:00 | 16:00 | No |
| 16:00 | 17:00 | No |
In January the overlap is 0 hours: there is no hour when both cities are in their working day. In July it is 0 hours: there is no hour when both cities are in their working day. The two working days do not overlap at all — the difference is too large. The only options are to meet at the edge of the day, to rotate the awkward hour, or to record the meeting.
Daylight saving in Hong Kong and Seoul
Hong Kong does not observe daylight saving, so its offset of UTC+08:00 never changes.
Seoul does not observe daylight saving, so its offset of UTC+09:00 never changes.
The difference never changes, so there is no date on which a standing meeting moves. That does not mean the difference is the same as the difference with a third city — the difference between Hong Kong and London, for example, may still move when London changes its clocks. The individual DST pages — Hong Kong DST 2026 and Seoul DST 2026 — give the exact dates for each city.
Best meeting windows
There is no window inside both working days, in January or in July. The least-bad options are the edges: 08:00 in Hong Kong is 09:00 in Seoul in January — before the working day in Hong Kong but a reasonable evening in Seoul — and 17:00 in Hong Kong is 18:00 in Seoul, which is the morning in Seoul the next day if the difference is large. Rotate the early start between the two sides, week by week, so the same people are not always the ones getting up early.
Calling and travel notes
When it is 09:00 in Hong Kong it is 10:00 in Seoul in January; when it is 12:00 in Hong Kong it is 13:00 in Seoul; when it is 17:00 in Hong Kong it is 18:00 in Seoul. The difference is under 12 hours, so the two cities are usually on the same date — but check the date for late-evening and early-morning times, when the date can differ by a day. Scheduling inside Asia is usually straightforward: most Asian countries do not observe daylight saving, so the difference between Hong Kong and Seoul never changes. The working days overlap for most of the day, and the only thing to check is the date: when the difference is large enough, the two cities can be on different dates for part of the day.
Worked conversions
Six conversions, for January (offsets Hong Kong UTC+08:00, Seoul UTC+09:00):
| Hong Kong | Seoul |
|---|---|
| 08:00 | 09:00 |
| 09:00 | 10:00 |
| 12:00 | 13:00 |
| 14:00 | 15:00 |
| 17:00 | 18:00 |
| 20:00 | 21:00 |
In July, the answers are the same. For the reverse direction, see Seoul to Hong Kong time.
Hong Kong and Seoul at a glance
| Fact | Hong Kong | Seoul |
|---|---|---|
| Country | Hong Kong | South Korea |
| Region | Asia | Asia |
| IANA time zone | Asia/Hong_Kong |
Asia/Seoul |
| Standard offset | UTC+08:00 | UTC+09:00 |
| Daylight saving offset | — does not observe | — does not observe |
| Offset in January 2026 | UTC+08:00 | UTC+09:00 |
| Offset in July 2026 | UTC+08:00 | UTC+09:00 |
| Observes daylight saving | No | No |
The table is the whole pair in one place. The two numbers that matter most are the January and July offsets: if they are the same in both columns for a city, that city's offset never changes; if they differ, the city observes daylight saving and the difference between the cities moves with it. The individual city pages — time in Hong Kong and time in Seoul — explain each city's time zone, and the DST pages — Hong Kong DST 2026 and Seoul DST 2026 — give the exact change dates.
Frequently asked questions
What is the time difference between Hong Kong and Seoul?
Seoul is 1 hour ahead Hong Kong right now. In January the difference is 1 hour ahead and in July it is 1 hour ahead — it is the same all year.
How do I schedule a recurring meeting between Hong Kong and Seoul?
Pick a time inside the overlap — the edge of the day, since there is no overlap — and set the calendar event in UTC so it moves correctly when the clocks change. Re-check the overlap in March and October, when the difference moves, and rotate the time if the meeting falls outside someone's working day.
What time is it in Seoul when it is 09:00 in Hong Kong?
It is 10:00 in January and 10:00 in July. The time zone converter gives the answer for any date.
What is the best time for a meeting between Hong Kong and Seoul?
There is no hour inside both working days. Meet at the edge of the day — early morning in one city, evening in the other — and rotate the awkward hour.
Does the time difference between Hong Kong and Seoul change during the year?
No. The difference is 1 hour ahead all year, because neither city observes daylight saving.
What time is it in Hong Kong when it is 09:00 in Seoul?
It is 08:00 in January and 08:00 in July. See Seoul to Hong Kong time for the full comparison from Seoul's side.
What are the time zones of Hong Kong and Seoul?
Hong Kong is in Asia/Hong_Kong (UTC+08:00 standard time) and Seoul is in Asia/Seoul (UTC+09:00 standard time).
What time is it in Hong Kong when it is midnight in Seoul?
It is 23:00 in Hong Kong in January and 23:00 in July — the same day, because Hong Kong is ahead of Seoul. Midnight conversions are the ones that most often land on the wrong date, so always check the date as well as the time.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's time zone converter and meeting planner — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.