Time Zone Calculator
Convert times between any time zones worldwide
Time Zone Converter takes a date and time in one time zone and shows the equivalent moment in another, using each zone's official IANA name (like "America/New_York" or "Asia/Tokyo") so daylight saving transitions are applied automatically and correctly for that specific date.
How to use Time Zone Calculator
- 1
Enter the date and time you want to convert.
- 2
Choose the source time zone.
- 3
Choose the destination time zone.
- 4
The converted local time in both zones is shown instantly.
Everything you need to know about time zone conversion
Why this is trickier than it looks
Time zone offsets aren't fixed — daylight saving time shifts many (not all) regions by an hour for part of the year, and not every country observes it, or observes it on the same dates. A conversion that's correct in July can be wrong in January for the same two cities.
When you actually need this
- Scheduling a meeting across time zones without a manual offset error.
- Coordinating with a remote team or client in a different region.
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Frequently Asked Questions
Why use zone names like "Europe/London" instead of GMT/UTC offsets?
A fixed offset (like UTC+1) doesn't know about daylight saving, so it gives the wrong answer for half the year in many regions. A named zone carries its own daylight-saving rules, so the conversion is correct for the specific date you enter, not just a snapshot offset.
Does it handle daylight saving automatically?
Yes — because the conversion uses the full IANA time zone database via the browser and server's built-in date handling, not a fixed offset, transitions are applied correctly based on the date you enter.
What date format should I use?
A standard date-and-time format such as 2026-07-15T14:00:00. If the input isn't a valid date, you'll get a clear error rather than a silently wrong result.
Does this tool send my input to a server?
Yes — the date and zone names are sent to our servers to compute the result and the result is returned to you; nothing is stored.
Is this tool free to use?
Yes — completely free, with no signup required.