How to use Time Zone Converter
- Enter the date under Date in the first zone.
- Enter the time under Time in the first zone, using the 24-hour clock.
- Type the zone you typed the time in under First zone (the time you typed), for example Europe/London.
- Type the zone you want under Second zone (the time you want), for example Asia/Tokyo.
- Both clock readings, both offsets and any change of day update as you change the fields.
Example: Time Zone Converter
Convert a 09:00 New York morning in March to London time.
Options
- If the local time happens twice
- A clock that moves back repeats an hour, so one local reading can name two different instants. Pick the earlier or the later one and the result says which you used.
- First zone and Second zone
- Both take IANA names such as Europe/Berlin or America/Los_Angeles. An unknown name is refused rather than treated as UTC.
- Time in the first zone
- A 24-hour reading of HH:MM or HH:MM:SS. Seconds are optional.
Supported inputs and limits
Where your input is processed
This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.
Where the zone rules come from
IANA maintains the time zone database that most operating systems and browsers use. Each named zone carries dated rules, including the start and end of daylight saving and later government changes, which is why the tool asks for a name rather than an offset.
A skipped hour and a repeated hour are two different problems
A spring clock change removes an hour, so local times inside that gap never occur. A fall clock change adds an hour, so one local time occurs twice. The first is an impossible input and the second is a choice between two instants.
Questions about Time Zone Converter
Why was my 02:30 refused as a time that does not exist?
Most US states move their clocks forward at 02:00, so 02:00 to 02:59 never happens on that date. The tool names the gap and asks for a later time.
The local time happens twice. Which occurrence should I pick?
It depends on the real moment. On 1 November 2026, 01:30 in America/New_York happens at UTC-04:00 and again at UTC-05:00, which is 05:30 and 06:30 in London.
Can I type EST or CET instead of a zone name?
No. The same abbreviation means different offsets in different countries and carries no clock-change rules, so use an IANA name such as Europe/Berlin.
Why do some pairs differ by 30 or 45 minutes?
Not every zone sits on a whole-hour offset. Asia/Katmandu is UTC+05:45 and Australia/Adelaide is UTC+09:30, so conversions land on a quarter or half hour.