Free tool
Timezone converter and time zone calculator
Convert a time from one city to several others, compare dates and UTC offsets, and avoid daylight saving surprises.
How to use the timezone converter
Choose the city or time zone you want to convert from, then add one or more target cities. The converter shows the current local time in each city, including the date, UTC offset, and whether the result falls on the previous or next day.
Times update automatically. Copy an individual result for a message, or copy a shareable link that keeps the selected source and target cities.
Why the date matters for daylight saving time
Time zone conversion is not just adding a fixed number of hours. Cities like New York and London change clocks on different dates, while places like Tokyo and Dubai do not observe daylight saving time. The same two cities can have different offsets at different points in the year.
This calculator uses IANA time zones for the selected date, so the offset shown for each city reflects daylight saving time where your browser supports the current rules.
Timezone converter vs meeting planner
Use this timezone converter when
You already know the time and need to see what that exact moment is in another city.
Use the meeting time zone planner when
You need to find the best time for several people across working hours.
If you need to choose a fair slot for multiple people, use the meeting time zone planner instead.
Popular timezone conversions
Start with a common conversion, then adjust the source or target cities.
- New York to London
- New York to Tokyo
- London to New York
- San Francisco to London
- Sydney to London
- London to Dubai
Common timezone abbreviations
Abbreviations like CST, IST, and PST can mean different things in different regions. For accurate results, use city names or IANA time zones such as America/New_York, Europe/London, or Asia/Tokyo.
Timezone converter FAQ
Answers to common questions about converting times across cities and daylight saving time.
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Choose a source city, then add the cities you want to convert to. The converter uses IANA time zones for the current date, so daylight saving time is handled automatically where your browser has current timezone rules.
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Yes. The converter calculates offsets for today's date instead of using a fixed offset forever. This matters for places like New York and London because their time difference changes during daylight saving transitions.
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Yes. It shows the current time in each selected city and refreshes every minute, so you always see a live conversion without entering a date or time.
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Yes. Add multiple target cities to convert one source time into several local times at once.
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A timezone converter answers what time one exact moment is in other cities. A meeting planner helps find the best meeting time across several people and working hours.
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Yes. It is free to use and does not require a Koalendar account.
