Time Zone Converter

Convert a moment in one city to local time everywhere else. Add or remove cities; daylight-saving rules built in. Runs in your browser.

Runs in your browser — nothing uploaded

Pick a moment in one city and see what time it is everywhere else. Handy for scheduling a meeting that spans continents, picking a launch time, or just answering "what time is it in Tokyo right now?"

Private by design — your data never leaves your device

How to use it

No account, no upload — it all happens on your device.

1
Set the date and time, and the time zone it belongs to.
2
See the same instant rendered in every city in the list below.
3
Add or remove cities to suit the meeting you're scheduling.

Common scheduling patterns

What people use this for.

  • Cross-team standup. A 10 AM London call lands at 5 AM in New York and 6 PM in Tokyo — see the whole picture before pinging anyone.
  • Launch windows. A Tuesday 9 AM ET product launch hits 9 PM in Sydney on Tuesday and 6 AM on the West Coast the same morning.
  • Travel planning.Convert your itinerary arrival/departure times so you don't miss connections.
  • Remote interviews. Confirm with a candidate in another country in their local time, not yours.

A note on time-zone math

Time zones are not a flat list of offsets — they're a database of rules that change over time. The IANA tz database tracks every DST transition, every zone split, every change in law. Browsers ship a copy and expose it via the Intl.DateTimeFormat API. This tool uses that API, so the answers match exactly what Node.js, Python, Go, and Java would produce from the same data.

For Unix timestamps (the number-of-seconds-since-1970 format used in code and logs), see the Unix Timestamp Converter. It's the right tool when the input is a number rather than a wall-clock time.

Frequently asked

Does the converter handle daylight-saving time?
Yes. We use the browser's built-in Intl timezone database, which knows current DST rules for every region. Pick a date in March or November and the offsets shift automatically.
Can I add or remove cities from the list?
Yes. Use the picker at the bottom to add a city. Click the × on any row to remove it from the list. Removals are local to the current page view — refresh and the defaults come back.
Why are some times an hour off what I expected?
Usually a DST edge: the source city and target city changed clocks on different dates, or one doesn't observe DST at all (Arizona, most of Asia). The converter follows the IANA tz database exactly, which is the authoritative source.

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