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§ · free tool

Time zone converter. One moment, every clock.

Pick a date, a time and a source zone, then see that exact moment in every city you choose, DST-correct, with UTC offsets and day-change badges. Converted locally in your browser; nothing is uploaded.

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A free online tool by Digital Heroes

Converted locally with your browser's own time-zone database (DST-correct), nothing is sent anywhere.

Zone Date Time Offset Day

One moment, every clock

This tool answers “when it's 3 pm Tuesday in Berlin, what time is it in Kolkata?”, a single moment converted into as many zones as you like, with the correct daylight-saving rules applied for that specific date. If you instead need to find a time that suits people in several countries by comparing their working hours side-by-side, use the Meeting Planner, its sister tool. Both run entirely on your device, free forever.

§ 02 · what you can do

Every clock, no mental math.

Convert any date & timeBetween hundreds of IANA time zones, with daylight saving handled correctly for that exact date.
Add unlimited citiesType a city name or zone identifier to filter the list, then add as many target zones as you need.
Offsets & day badgesUTC offsets plus +1 / −1 day badges show at a glance when a moment lands on a different calendar day.
12-hour or 24-hourSwitch the display format with one click, your preference is remembered on this device.
Copy rows or the tableCopy a single row or the whole conversion to paste into emails, messages or calendar invites.
Download a CSVExport every converted time for spreadsheets or reports, generated locally, nothing uploaded.
§ 03 · how to use it

Four steps, no manual.

  1. Choose your source time zone, then enter the date and time to convert, or tap Now to pre-fill the current moment.
  2. Search for a target city or zone in the filter box, select it, and tap + Add (or press Enter). Repeat for every zone you need.
  3. Read the converted times in the table. The day badges flag when the moment falls on a different day, and Swap flips the source with your first target zone.
  4. Copy a row, hit Copy all, or Download CSV when you're done, your zones and format are saved for next time.
§ 04 · faq

Frequently asked questions.

Is the Time Zone Converter free?
Yes, completely free for everyone. No sign-up, no account and no usage limits.
Is it private? Is my data uploaded anywhere?
No upload, ever. Conversions run entirely in your browser using its built-in time-zone database, and your saved zones live only in this browser's local storage.
Does it handle daylight saving time correctly?
Yes. It uses your browser's IANA time-zone rules for the specific date you enter, so DST transitions, half-hour offsets (like India's UTC+5:30) and historical rule changes are all applied automatically.
What do the +1 day / −1 day badges mean?
They show when the converted moment lands on a different calendar day than the source. A 9 pm Friday call in New York is +1 day in Tokyo, it happens on Saturday there. “Same day” means no date change.
Does it work offline?
Once the page has loaded, yes, every conversion, copy and CSV export runs locally on your device, so no connection is needed to keep working.
Will it remember my zones next time?
Yes, your source zone, target zones and 12/24-hour preference are saved in this browser automatically and restored when you return. Reset zones brings back the defaults.

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