Time Zone Converter & Meeting Planner for 3 Cities

A time zone converter and meeting planner (world clock, 시차 계산기) shows what time it is in other cities when you pick a time in yours, and finds the hours when all participants are at work.

Choose a date and time in city 1, which is detected from your device, then pick two other cities from the list, such as Seoul, Tokyo, London, New York or Los Angeles.

Each card shows the local time, the weekday and date, and whether it falls inside the office hours you set, 9:00 to 18:00 by default.

The box at the bottom lists the hours in city 1 when all three cities are within office hours. How much is the time difference between Seoul and New York?

Korea uses UTC+9 all year with no daylight saving time, while New York is UTC-5 in winter and UTC-4 in summer, so Seoul is 14 hours ahead in winter and 13 hours ahead in summer.

For example, 10:00 on a January morning in Seoul is 20:00 the previous evening in New York and 01:00 in London. Is daylight saving time handled?

Yes, the browser applies each city's rules for the date you choose, which matters because the United States and Europe change their clocks on different dates, so the gap between London and New York is not always 5 hours.

Why are there no shared hours? Cities far apart, such as Seoul and New York, may have no overlap in a 9 to 18 workday, so widen the office hours or choose a compromise time.

Calculation uses your browser's built-in time zone data, and nothing you enter is sent to a server. Check important meetings with the participants.