Does this need internet?

No. It uses the browser's built-in Intl API and IANA timezone database, which is bundled with every modern browser. All conversion happens locally — your data never leaves your device.

Does it handle daylight saving time (DST)?

Yes. Because conversions use the browser's real timezone database, DST transitions are handled automatically and correctly for every region.

What extras does this tool have?

Extras: (1) 400+ IANA timezones; (2) Convert between any two zones; (3) See the moment in ALL zones at once; (4) Automatic DST + UTC offset display; (5) 12/24-hour toggle; (6) Now button; (7) Copy result; (8) Swap zones; (9) Searchable zone list with city names; (10) Date + time together; (11) Meeting-friendly time summary; (12) 100% offline.

Developer Runs in your browser

Timezone Converter

Convert a date & time between any two IANA timezones — fully offline with the browser's native timezone database. See the result in all timezones at once, with DST handling, UTC offset, and 12/24-hour toggles. 100% private.

100% Private Works Offline Instant

Date & time (in source zone)

From timezone

To timezone

Source (Kolkata) +05:30

Tue, 15 Sept 2026 · 06:43:00 am

Target (New York) -04:00

Mon, 14 Sept 2026 · 09:13:00 pm

Same moment across timezones

UTC+00:00 · -5.5 hours01:13:00 am

Los Angeles-07:00 · -12.5 hours06:13:00 pm

Denver-06:00 · -11.5 hours07:13:00 pm

Chicago-05:00 · -10.5 hours08:13:00 pm

New York-04:00 · -9.5 hours09:13:00 pm

Toronto-04:00 · -9.5 hours09:13:00 pm

São Paulo-03:00 · -8.5 hours10:13:00 pm

Mexico City-06:00 · -11.5 hours07:13:00 pm

Bogotá-05:00 · -10.5 hours08:13:00 pm

Lima-05:00 · -10.5 hours08:13:00 pm

Caracas-04:00 · -9.5 hours09:13:00 pm

London+01:00 · -4.5 hours02:13:00 am

Dublin+01:00 · -4.5 hours02:13:00 am

Lisbon+01:00 · -4.5 hours02:13:00 am

Paris+02:00 · -3.5 hours03:13:00 am

Madrid+02:00 · -3.5 hours03:13:00 am

Berlin+02:00 · -3.5 hours03:13:00 am

Amsterdam+02:00 · -3.5 hours03:13:00 am

Brussels+02:00 · -3.5 hours03:13:00 am

Rome+02:00 · -3.5 hours03:13:00 am

Zurich+02:00 · -3.5 hours03:13:00 am

Stockholm+02:00 · -3.5 hours03:13:00 am

Oslo+02:00 · -3.5 hours03:13:00 am

Copenhagen+02:00 · -3.5 hours03:13:00 am

Vienna+02:00 · -3.5 hours03:13:00 am

Warsaw+02:00 · -3.5 hours03:13:00 am

Prague+02:00 · -3.5 hours03:13:00 am

Athens+03:00 · -2.5 hours04:13:00 am

Helsinki+03:00 · -2.5 hours04:13:00 am

Bucharest+03:00 · -2.5 hours04:13:00 am

Istanbul+03:00 · -2.5 hours04:13:00 am

Kyiv+03:00 · -2.5 hours04:13:00 am

Moscow+03:00 · -2.5 hours04:13:00 am

Dubai+04:00 · -1.5 hours05:13:00 am

Riyadh+03:00 · -2.5 hours04:13:00 am

Tehran+03:30 · -2 hours04:43:00 am

Karachi+05:00 · -0.5 hours06:13:00 am

Kolkata+05:30 · same time06:43:00 am

Shanghai+08:00 · +2.5 hours09:13:00 am

Hong Kong+08:00 · +2.5 hours09:13:00 am

Taipei+08:00 · +2.5 hours09:13:00 am

Tokyo+09:00 · +3.5 hours10:13:00 am

Seoul+09:00 · +3.5 hours10:13:00 am

Singapore+08:00 · +2.5 hours09:13:00 am

Bangkok+07:00 · +1.5 hours08:13:00 am

Jakarta+07:00 · +1.5 hours08:13:00 am

Manila+08:00 · +2.5 hours09:13:00 am

Kuala Lumpur+08:00 · +2.5 hours09:13:00 am

Jerusalem+03:00 · -2.5 hours04:13:00 am

Kathmandu+05:45 · +0.25 hours06:58:00 am

Dhaka+06:00 · +0.5 hours07:13:00 am

Colombo+05:30 · same time06:43:00 am

Kabul+04:30 · -1 hour05:43:00 am

Sydney+10:00 · +4.5 hours11:13:00 am

Melbourne+10:00 · +4.5 hours11:13:00 am

Brisbane+10:00 · +4.5 hours11:13:00 am

Perth+08:00 · +2.5 hours09:13:00 am

Auckland+12:00 · +6.5 hours01:13:00 pm

Cairo+03:00 · -2.5 hours04:13:00 am

Lagos+01:00 · -4.5 hours02:13:00 am

Nairobi+03:00 · -2.5 hours04:13:00 am

Johannesburg+02:00 · -3.5 hours03:13:00 am

Buenos Aires-03:00 · -8.5 hours10:13:00 pm

Uses your browser's built-in IANA timezone database — 100% offline, DST-aware. No data leaves your device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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