Find the best meeting times across multiple cities. See overlapping business hours across any combination of time zones.
Acceptable windows (some early/late start)
| 🇬🇧 London (base) | 🇺🇸 New York | 🇯🇵 Tokyo |
|---|---|---|
| 12am | 7pm-1d | 8am |
| 1am | 8pm-1d | 9am |
| 2am | 9pm-1d | 10am |
| 3am | 10pm-1d | 11am |
| 4am | 11pm-1d | 12pm |
| 5am | 12am | 1pm |
| 6am | 1am | 2pm |
| 7am | 2am | 3pm |
| 8am | 3am | 4pm |
| 9am | 4am | 5pm |
| 10am | 5am | 6pm |
| 11am | 6am | 7pm |
| 12pm | 7am | 8pm |
| 1pm | 8am | 9pm |
| 2pm | 9am | 10pm |
| 3pm | 10am | 11pm |
| 4pm | 11am | 12am+1d |
| 5pm | 12pm | 1am+1d |
| 6pm | 1pm | 2am+1d |
| 7pm | 2pm | 3am+1d |
| 8pm | 3pm | 4am+1d |
| 9pm | 4pm | 5am+1d |
| 10pm | 5pm | 6am+1d |
| 11pm | 6pm | 7am+1d |
With a team spread across London, Singapore, and New York, there is no overlap of normal business hours. London and Singapore share 09:00–17:00 overlap only when London evening (17:00–18:00) meets Singapore morning (01:00). The best compromise meeting window is early London morning / Singapore afternoon — though someone always ends up at an inconvenient hour.
The US, EU, UK, and Australia all change their clocks — but on different dates. The US typically changes on the first Sunday in November, the UK on the last Sunday in October, and the EU on the last Sunday in October. During the transition weeks, the offsets between regions change, invalidating standing meeting times.
Not all time zones are offset by whole hours. India is UTC+5:30, Nepal is UTC+5:45, Iran is UTC+3:30, and Australia's Northern Territory is UTC+9:30. Always verify exact offsets rather than assuming whole-hour differences.
When scheduling across time zones, it's generally considered polite to rotate inconvenient times fairly rather than always expecting the same party to take the difficult slot. A recurring meeting that always favours one region's convenience signals an imbalance of power in the relationship.
For complex multi-party scheduling, tools like World Time Buddy, Every Time Zone, and Calendly's time zone detection handle the complexity automatically. For ad hoc conversions, this tool or a quick search works well.
Find the best meeting times across multiple cities and time zones. See when business hours overlap so everyone can meet at a reasonable time.
London + New York overlap
14:00–18:00 London = 09:00–13:00 New York
London + Singapore overlap
Very limited — 09:00 Singapore = 02:00 London
The International Date Line is not a straight line — it bends around Russia, Kiribati, and Samoa so that countries don't get split across two calendar days. Kiribati, which spans both sides of the anti-meridian, lobbied in 1994 to move the Date Line east so the entire nation shares the same date.
The displayed relationship uses time-zone rules and the current date context, but offsets can change during daylight-saving transitions and historical rules are not identical everywhere. Recheck a recurring meeting near a clock change and include the date in invitations. Name the city or IANA time zone rather than relying on an abbreviation such as CST.
Start with the overlap between working hours, then look for a slot that avoids the extremes of the day for every participant. When no perfect overlap exists, rotate the inconvenient time, record the meeting in each person’s local zone, and offer an asynchronous alternative. A technically possible time is not automatically a considerate one.
Cities may use half-hour or quarter-hour offsets, and daylight-saving rules can differ by country or region. Political decisions can also change future rules. Select the precise city or region, confirm the date, and check the calendar invitation after saving it. Do not manually add hours when a time-zone-aware calendar can convert it.
Choose whether the meeting should stay at one location’s local time or at a fixed instant for everyone, because daylight-saving changes can shift the other participants’ local hour. Include the date, city or IANA time zone, and a calendar-zone-aware invitation. Recheck the series before seasonal clock changes and tell attendees how exceptions will be handled.