The time difference between Seoul and Hanoi is 2 hours. When it is 12:00 noon in Seoul, it is 10:00 in Hanoi. Seoul uses the Asia/Seoul time zone (UTC+9), while Hanoi uses Asia/Ho_Chi_Minh (UTC+7).
There are 6 overlapping business hours between Seoul and Hanoi (assuming 9:00–17:00 in each city). The ideal window for calls and meetings is:
Use this table to quickly convert any hour from Seoul time to Hanoi time. Rows highlighted in green indicate overlapping business hours in both cities.
| Seoul | Hanoi | |
|---|---|---|
| 00:00 | 22:00 (-1 day) | Night |
| 01:00 | 23:00 (-1 day) | Night |
| 02:00 | 00:00 | Night |
| 03:00 | 01:00 | Night |
| 04:00 | 02:00 | Night |
| 05:00 | 03:00 | Night |
| 06:00 | 04:00 | |
| 07:00 | 05:00 | |
| 08:00 | 06:00 | |
| 09:00 | 07:00 | |
| 10:00 | 08:00 | |
| 11:00 | 09:00 | Overlap |
| 12:00 | 10:00 | Overlap |
| 13:00 | 11:00 | Overlap |
| 14:00 | 12:00 | Overlap |
| 15:00 | 13:00 | Overlap |
| 16:00 | 14:00 | Overlap |
| 17:00 | 15:00 | |
| 18:00 | 16:00 | |
| 19:00 | 17:00 | |
| 20:00 | 18:00 | |
| 21:00 | 19:00 | |
| 22:00 | 20:00 | Night |
| 23:00 | 21:00 | Night |
Neither Seoul nor Hanoi is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 2 hours. Hanoi is 2 hours behind Seoul.
It can. If either Seoul or Hanoi observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
The best window is between 11:00 and 17:00 Seoul time, which corresponds to 09:00–15:00 in Hanoi. Both sides fall within normal business hours.
Subtract 2 hours from Seoul time to get Hanoi time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.