Time zone converter. One moment, every clock.

How to use the Time Zone Converter

This converter takes one date and time in one time zone and shows that same moment in every zone on your list. It uses your browser's built in time zone rules for the exact date you pick, so daylight saving changes and half hour offsets are applied for you. Use it to set a call, a launch or a deadline for people in other countries.

Step by step

1. 1
   Pick the source zone

   Open From time zone and choose the zone the time is written in. On your first visit it starts on your device's own time zone, and after that on the zone you used last. Zones are listed by city, such as Kolkata, Asia.

2. 2
   Set the date and time

   The Date and Time fields open filled with the current moment. Change them to the moment you want to convert, or press Now to jump back to the current date and time. The table updates as you edit.

3. 3
   Add the zones you need

   Type a city or zone name in Find a city / zone, for example Tokyo or UTC. Choose the right entry under Matching zones, then press + Add or hit Enter in the search box. Zones already on your list are left out of the matches.

4. 4
   Choose 12 or 24 hour time

   Press 12-hour or 24-hour above the table. 12-hour is the starting format.

5. 5
   Swap or remove zones

   Press Swap to make the first zone on your list the new source. The moment stays the same and only the way it is written changes. Press the cross at the end of a row to remove that zone.

6. 6
   Copy or export the result

   Press the copy icon on a row to copy that one line, Copy all to copy the whole table as text, or Download CSV for a file called timezone-conversion.csv. Reset zones brings back the starting list, your own zone as the source and the current time.

Reading the table

• The first row, tagged From, is your source zone. Every other row is the same moment in another zone.
• Offset is how far that zone is from UTC on that date, for example UTC+5:30 for Kolkata. A zone with daylight saving shows a different offset in summer and winter.
• Day shows same day, +1 day or -1 day when the moment falls on a different calendar date than in the source zone.
• Worked example: 9:00 PM on an October evening in New York is UTC-4 there, so Kolkata shows 6:30 AM, UTC+5:30, with a +1 day badge.
• The CSV has the columns Zone, City, Date, Time, UTC offset and Day shift, one row per zone.

Tips and common mistakes

• Always check the date as well as the time. Daylight saving starts and ends on different dates in different countries, so the gap between two cities can change for a week or two each spring and fall.
• Search by the city the zone is named after. Many cities share a zone named after a bigger one, so for San Francisco look for Los Angeles, and for Mumbai look for Kolkata.
• Use UTC as a target when you write for a mixed audience. It never changes for daylight saving.
• The date and time are not saved. Each time you open the page they reset to now, while your zones stay.
• If your browser is old, the zone list may be limited to a short built in set of about two dozen major zones.

Privacy and limits

Every conversion runs in your browser with its own time zone data, and nothing is sent to a server. Your source zone, your list of zones and the 12 or 24 hour choice are saved in this browser's local storage under the key dh_tzconv. Clearing site data removes them.

Back to the tool

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Frequently asked questions.

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For spans of time rather than clock times, the unit converter turns hours into minutes, days into hours and weeks into days, alongside length, weight and temperature. If your source value is a Unix epoch rather than a clock time, turn it into a date first with the epoch to date converter.