Time Zone Converter
Accurately convert times between cities and time zones using the Intl API
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Enter a date and time in a reference city and it converts them all at once to the local times of cities you choose, like New York, London, and Tokyo. Using the browser's Intl time zone data, it also shows each region's UTC offset and any date rollover (+1 day / −1 day).
How to use
- Pick a reference city and enter the date and time. Use 'Set to reference city's current time' to fill in the current time.
- Click the city buttons below to select as many cities to convert as you like.
- Check each city's local time, UTC offset, and date difference (+1 day, etc.).
- Use 'Copy all' to copy the conversion results at once.
FAQ
- Can I use it to line up a meeting across countries?
- Yes. Put your own time zone as the reference city and select the other cities, and it shows what time that same moment is in each region and whether the date crosses over to the next day. It's handy for international video calls and coordinating deadlines.
- Is daylight saving time (DST) accounted for?
- It uses the browser's built-in IANA time zone database, so each city's DST status is applied automatically. It calculates the offset for the date you enter, handling regions whose time difference changes between summer and winter.
- Is the conversion always accurate?
- It follows standard Intl time zone data, but around the moments DST begins or ends (a nonexistent or duplicated hour) the value can be ambiguous, so treat it as a reference. For important schedules, we recommend double-checking the actual local time with the other party.