South Korea is 3 hours 30 minutes ahead of Colombo. When it's noon in South Korea, it's 08:00 in Colombo.
South Korea observes Asia/Seoul and Colombo observes Asia/Colombo — a 3.5 hours 30 minutes gap between them.
Shared working hours
Both South Korea and Colombo are simultaneously in business hours for 4.5 hours per day (assuming standard 9:00–17:00 working hours).
00:0006:0012:0018:0024:00
South Korea
Colombo
Overlap (4.5h)
Meeting time recommendations
South Korea and Colombo share 4.5 hours of business hours overlap daily. Showing the 3 most balanced slots — see the time table below for the full window.
13:00 Seoul / 09:00 Colombo✓ Both working
14:00 Seoul / 10:00 Colombo✓ Both working
15:00 Seoul / 11:00 Colombo✓ Both working
Assumes a standard 9 AM–5 PM workday in each location's local timezone.
Public holidays this year
South Korea6 holidays
Sep 24ChuseokSOON
Sep 25ChuseokSOON
Sep 26ChuseokSOON
Oct 3National Foundation DaySOON
Oct 9Hangul Day
Colombo
No upcoming public holidays this year.
South Korea and Colombo — practical scheduling
Teams in South Korea (South Korea) and Colombo (Sri Lanka) face a 3.5-hour time difference day to day. A 4.5-hour shared business hours window makes real-time meetings feasible for both sides within their normal working day.
💡 Practical scheduling guidelines
✅
Schedule at 13:00–14:00 (South Korea) for a 09:00–10:00 slot in Colombo — the sweet spot where both teams are working.
✅
Schedule at 14:00–15:00 (South Korea) for a 10:00–11:00 slot in Colombo — the sweet spot where both teams are working.
✅
Schedule at 15:00–16:00 (South Korea) for a 11:00–12:00 slot in Colombo — the sweet spot where both teams are working.
Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.
Drag the slider at the top to convert any South Korea time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.
