Time Zone Converter
Choose a date and time in one place and instantly see what it is in the zones you care about. Daylight saving rules for the chosen date are applied automatically.
Runs in your browser. Your files are never uploaded.
Loading Time Zone Converter…
How to use Time Zone Converter
- Select the starting time zone and enter the date and time there, or press Now to use your own current time.
- Review the same moment in the default list of zones.
- Add more zones from the drop-down, or remove those you do not need.
- Use the 12-hour option if you prefer AM and PM.
Why time zones are tricky
The world is split into zones that are mostly whole hours from Coordinated Universal Time (UTC), but several places use half-hour or 45-minute offsets, such as India at UTC+5:30 and Nepal at UTC+5:45. On top of that, many countries shift their clocks for daylight saving at different dates, and some do not shift at all. Because of this, the difference between two cities can change during the year.
Always convert using the date you mean. London and New York are usually five hours apart, but for a few weeks in March and in autumn they are four hours apart, because the two countries change clocks on different days.
Scheduling across zones
When planning a meeting, convert from the organiser’s zone and list the result for everyone, including the date. A note like “next day” matters when someone is far east of you. Try to find a window that falls in reasonable hours for everyone, and rotate the inconvenience if the group is permanent.
For recurring events, remember that the local time may stay fixed in one zone while shifting for others when daylight saving starts or ends. State the zone your schedule is anchored to.
Useful habits
- Write times with a zone, such as 15:00 UTC or 9:00 AM Eastern.
- Use UTC as a neutral reference for global teams and logs.
- Check the date as well as the hour when zones are far apart.
- Double-check events close to a daylight saving change.
- Remember that some regions have changed their rules in recent years; keep your browser up to date.
Limits
The results rely on your browser’s built-in time zone data, which is usually current but may lag behind very recent government changes. Only future dates within the supported range are reliable, since governments can change future rules.
Why use this time zone converter tool
- Daylight saving aware. Uses the browser’s time zone database, so each zone follows its own rules for the date you pick.
- All IANA zones. Every region the browser knows, such as Asia/Kolkata or America/Sao_Paulo.
- Day shift notes. Tells you when the other place is on the next or previous day.
- Works privately. No account, and no times are sent anywhere.
Frequently asked questions
What does an IANA time zone name mean?
IANA names such as Europe/London or America/New_York identify a region and all its historical and future clock rules, including daylight saving. They are more reliable than abbreviations like EST or IST, which can mean different things in different countries.
Why does the tool say my time does not exist?
When clocks jump forward for daylight saving, an hour is skipped, for example 02:30 on that spring morning in New York. That wall-clock time never happens. The tool shows the nearest valid instant and warns you.
What if a time occurs twice in autumn?
When clocks go back, one hour repeats. The converter uses the first occurrence, so double-check the offset shown if your meeting falls in that hour.
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