Short answer: Korea Standard Time (KST) is UTC+9 all year, because South Korea does not use daylight saving time. When it is 9 am in Seoul, it is 8 pm the previous day in New York during US daylight saving time and 7 pm the rest of the year. Click any hour in the planner below and every city updates.
How to use it
- Pick a place, date and time, or click an hour in the planner.
- Add the cities you need with “Add a city”. Click ☆ to make a city the base.
- Hours that are green (9 am–6 pm) on every row are the easiest meeting times. The tool lists them under the planner.
- Use “Copy times” to paste into a chat, or “Copy link” to send it. People who open the link see the time in their own zone.
Time difference between Seoul and major cities
| City | While that city is on daylight saving time | Rest of the year |
|---|---|---|
| Beijing, Shanghai, Taipei, Hong Kong, Singapore | Seoul is 1 hour ahead (no DST) | |
| Tokyo | Same time (no DST) | |
| London | Seoul is 8 hours ahead | 9 hours ahead |
| Paris, Berlin | 7 hours ahead | 8 hours ahead |
| New York | 13 hours ahead | 14 hours ahead |
| Los Angeles | 16 hours ahead | 17 hours ahead |
| Sydney | 2 hours behind | 1 hour behind |
What was checked
On 16 October 2026 Sitecurio compared the tool with Python’s IANA time zone data (zoneinfo) for ten places — Seoul, New York, London, Sydney, Kathmandu (UTC+5:45), New Delhi, São Paulo, Auckland, Phoenix and Tehran — at eight moments. These included just before and after the end of US daylight saving time (06:00 UTC on 1 November 2026), the UK change on 25 October and Sydney’s change on 4 October. All 80 local times, UTC offsets and DST labels matched. A link made for 10:00 on 20 October in Seoul opened as 21:00 on 19 October in a browser set to New York time. On a 25-hour day (New York, 1 November 2026) the planner shows 25 hour cells.
FAQ
Does Korea have daylight saving time?
No. KST is UTC+9 all year, so the gap with Korea changes by an hour on the days other countries start or end daylight saving time.
Does China have more than one time zone?
No. All of China uses Beijing time (UTC+8), so Shanghai, Guangzhou and Chengdu are all one hour behind Seoul.
What counts as working hours?
The planner marks 9 am–6 pm as working hours (green) and 7–9 am and 6–10 pm as early or late hours (yellow) in every city. Real office hours vary.
Is anything stored?
No. The calculation runs in your browser, and a shared link only contains the cities and the time you picked.
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