Timezone Converter
Converts a moment across timezones and shows a shared-hours grid for scheduling across regions.
One moment, shown in several places at once, with a grid of the hours that are inside working hours for everybody. It is for the two questions a meeting across regions raises: what time is that for them, and is there any hour that suits all of us.
Moment
Elsewhere
- Asia/Seoul2026-11-10 13:57UTC+09:00
- America/Los_Angeles2026-11-09 20:57UTC-08:00different day
- America/New_York2026-11-09 23:57UTC-05:00different day
- Europe/London2026-11-10 04:57UTC+00:00
Shared hours
| Asia/Seoul | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| America/Los_Angeles | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 |
| America/New_York | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 |
| Europe/London | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 |
Each column is one hour of the source day. A shaded cell is inside working hours there.
How to use it
Set the moment
A date and a time in one of the zones. Everything else follows from it; there is no separate "source" to keep in sync.
Add the zones you care about
Cities rather than offsets, because an offset does not know about summer time and a city does. Seoul, New York and London are not a fixed number of hours apart all year.
Read the grid for a workable hour
Each column is an hour of the day and each row a zone, shaded by whether that hour is inside working hours there. A column shaded all the way down is a meeting nobody has to take at midnight.
Common questions
Does it handle daylight saving?
Yes. Zones are resolved through the browser’s own IANA database, so the offset used is the one in force on the date you set, not today’s. Korea has no summer time, which is exactly why it is easy to forget that its partners do.
Why do some conversions land on a different date?
Because zones can be more than a day apart in effect. 9 a.m. Monday in Seoul is 8 p.m. Sunday in New York during US daylight time (7 p.m. in winter), and treating that as the same day is how a deadline gets missed by twenty-four hours.
What about a time that does not exist?
On the spring-forward night an hour is skipped, and on the autumn night one hour happens twice. The page says so rather than picking one silently, because which one you meant is a question only you can answer.
Feed it from
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