Meeting Planner — Multi-City Time Zone Overlap Finder
Date & TimeA meeting planner compares the UTC offsets of two to five cities and shows, in a 24-hour table, the meeting slots where every city falls inside working hours (09:00–18:00).
What is it
Scheduling across time zones means finding hours that land inside everyone's working day. This tool converts each hour (0–23) of the base city into local times of the other cities using fixed standard UTC offsets (Seoul +9, London 0, New York −5, and so on), and marks a row as an overlap when the meeting start time falls between 09:00 and 17:00 in every city (so a one-hour meeting ends by 18:00). Daylight saving time is not applied automatically, so offsets can differ by one hour during DST periods. Everything is calculated in your browser.
How to use
- 1Select two to five cities to compare (the first city is the base).
- 2Press compare to build the 24-hour conversion table.
- 3Pick a meeting time from the rows marked as overlap (✓) where every city is inside working hours.
Reference
| Seoul (UTC+9) | Tokyo (UTC+9) | Singapore (UTC+8) | Overlap |
|---|---|---|---|
| 10:00 | 10:00 | 09:00 | ✓ |
| 09:00 | 09:00 | 08:00 | — |
| 23:00 | — |
Sources & standards
- IANA Time Zone Database - IANA
- ECMAScript Language Specification - Ecma International
FAQ
Does the meeting planner apply daylight saving time?
No. It uses fixed standard offsets per city. Cities such as New York and London shift by one hour during DST, so adjust the result by one hour in those periods.
What counts as working hours?
Working hours are 09:00–18:00. A row is marked as an overlap (✓) when the meeting start hour is between 09:00 and 17:00 in every selected city, so a one-hour meeting finishes by 18:00.
Is meeting planner input sent to a server?
No. City selection and time conversion run entirely in your browser and nothing is sent to a server.