Timezone Converter
Set a time once and see what it is in cities anywhere in the world.
| Timezone | Local time | UTC offset |
|---|
Daylight saving is resolved for the date you actually picked, not from a fixed offset — so the result stays correct across the weeks when clocks change.
About this tool
The timezone converter lets you set a time once and immediately see what it is in as many other cities as you care about.
The job it is built for is scheduling across countries, where the expensive mistake is not being an hour out — it is being on the wrong day. 09:00 Monday in Bangkok is Sunday evening in Los Angeles. That is why the table labels a reading as "next day" or "previous day" rather than making you work it out.
The part people underestimate is daylight saving. Many countries shift twice a year, and a converter that hard-codes an offset is an hour wrong for half of it. This one resolves the offset for the exact date you selected.
Everything is computed from the timezone database built into your browser — no external API, and it works offline.
How to use
- 1Pick the source timezone, then set the date and time you want to compare
- 2Use "current time" to compare right now
- 3Add as many cities as you like from the picker below the table
- 4Watch for the "next day" / "previous day" badge so you do not book the wrong date
Frequently asked questions
- Is daylight saving handled correctly?
- Yes. The offset is looked up for the date you actually chose, not taken as a constant — so London in July and London in January differ by an hour, as they really do.
- Why do some cities show "next day"?
- Because the same instant can fall on a different calendar day in each country. That is the mistake people make most often when scheduling across timezones, so it is labelled explicitly.
- Are half-hour timezones supported?
- Yes — India (+05:30), Nepal and the rest. It uses the browser’s standard timezone database, so fractional offsets are correct.
- Does it need an internet connection?
- No. Everything is computed from the timezone database built into your browser; no API is called.
- How accurate is it?
- As accurate as your browser’s timezone database, which ships with your operating system and tracks changes to each country’s DST rules.