Time Zone Converter

The date and time box is labelled your local time, and it means it: whatever you enter is taken as a time on your device's clock, in the time zone your device is set to. The From and To boxes don't change how your input is read. They choose which two zones appear side by side in the result cards.

Say your laptop is set to New York time and you enter 09:00 on Tuesday 20 October 2026, with the default From (New York) and To (Kolkata). The cards show Tue, Oct 20, 09:00 AM for New York and Tue, Oct 20, 06:30 PM for Kolkata.

If you leave the box empty, the tool uses the moment the page loaded. That time doesn't tick forward while the page is open, so reload the page for a fresh "now".

Because the input is always your own time, converting a time fixed somewhere else takes one extra step. Suppose you are in New York and a colleague in London proposes 15:00 London time on 20 October. You want to know what that is in Tokyo.

1. Set From to London and To to Tokyo.
2. Change the time in the input box until the London card reads 03:00 PM. For a New York device, that happens at 10:00.
3. Read the Tokyo card: Tue, Oct 20, 11:00 PM.

As a bonus, the input box now holds the same moment in your own time, 10:00 in New York. The UTC row in the table, 02:00 PM here, is a neutral reference if you need to write the time down for people in several places.

The conversion uses your browser's built-in copy of the IANA Time Zone Database, the standard collection of time zone offsets and daylight saving rules, which records how local time has changed in each region. The gap between two cities is worked out for the date you enter, not fixed.

The same 09:00 New York input on two dates two weeks apart, from a device set to New York time:

New York's clocks change between those two dates. The London gap stays the same because London's clocks also change in that period, while the Kolkata and Sydney gaps grow by an hour. A meeting set by a fixed gap you remember from earlier in the year can be an hour out.

Countries do change their rules from time to time. Your browser's copy of the database is updated with browser and system updates, so keep them current if you rely on far-future dates.

• Date shifts. Each result includes the weekday and date, because a conversion often crosses midnight. 09:00 on Tuesday in New York is already Wednesday in Sydney.
• Format. Once the page has loaded, times follow your device's language and 12- or 24-hour setting.
• The table. Below the cards, a fixed list of 12 zones (UTC, seven zones in the Americas from New York to Lima, and London, Paris, Berlin and Madrid) shows the same moment. It doesn't change with your From and To choices.
• Coverage. The drop-downs hold 21 zones. If your city isn't one of them, a listed zone only stands in for it if both use the same offset and change their clocks on the same dates all year.