United States is 10 hours 30 minutes behind Colombo. When it's noon in United States, it's 21:00 in Colombo.
United States runs on America/New_York; Colombo runs on Asia/Colombo. Together they are 9.5 hours 30 minutes apart.
Daily overlap window
There is no business hours overlap between United States and Colombo during standard working hours (9:00–17:00). Meetings would require one party to work outside normal hours.
Best call times between these locations
United States and Colombo have no shared working window. These slots minimize out-of-hours disruption for both sides.
07:00 New York / 16:00 Colombo⚡ One side off-hours
⚠️ 2h before working hours in New York
09:00 New York / 18:00 Colombo⚡ One side off-hours
⚠️ 2h after working hours in Colombo
06:00 New York / 15:00 Colombo⚡ One side off-hours
⚠️ 3h before working hours in New York
Working hours defined as 09:00–17:00 local time for each location.
Public holidays this year
United States6 holidays
Sep 7Labour DaySOON
Oct 12Columbus Day
Oct 12Indigenous Peoples' Day
Nov 11Veterans Day
Nov 26Thanksgiving Day
Colombo
No upcoming public holidays this year.
United States and Colombo — practical scheduling
Coordinating between United States (USA) and Colombo (Sri Lanka) means working around a 9.5-hour time difference. Since standard business hours don't naturally overlap, meetings usually require one side to shift slightly outside their normal working day.
💡 Practical scheduling guidelines
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A 07:00 meeting in United States means 16:00 in Colombo (2h before working hours in New York).
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A 09:00 meeting in United States means 18:00 in Colombo (2h after working hours in Colombo).
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A 06:00 meeting in United States means 15:00 in Colombo (3h before working hours in New York).
With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am United States".
