Time Zone Converter

A time zone converter translates a wall-clock time in one location to the equivalent wall-clock time in another, accounting for each zone's offset from UTC (Coordinated Universal Time) and any daylight saving time in effect on the chosen date. It's the everyday tool for scheduling meetings, booking flights, calling family abroad, or coordinating a remote team across continents.

The converter uses the modern IANA time zone database via your browser's built-in Intl APIs. That means it handles DST transitions automatically — a 3 PM call from New York to London is four hours ahead in winter but five hours ahead during the brief late-March window when London has switched to BST but New York is still on EST. Always pick the actual date you mean to convert, not just a time.

You want to schedule a video call at 2:00 PM in New York on July 15with colleagues in London, Mumbai, and Tokyo.

• New York (America/New_York) — 2:00 PM EDT = UTC−4
• London (Europe/London) — 7:00 PM BST (UTC+1)
• Mumbai (Asia/Kolkata) — 11:30 PM IST (UTC+5:30)
• Tokyo (Asia/Tokyo) — 3:00 AM next day JST (UTC+9)

Tokyo is the breaking point — 3 AM is unworkable. Move the meeting earlier to 8:00 AM New York time and you get 1:00 PM London, 5:30 PM Mumbai, and 9:00 PM Tokyo, which is acceptable to all four.

• Scheduling international meetings — find a time that lands in working hours for everyone.
• Booking travel — interpret arrival times that already display in the destination zone.
• Coordinating product launches — line up press releases, server cutovers, or sales events to a single UTC moment.
• Live event scheduling — webinars, sports broadcasts, and game launches need to convert cleanly to viewers worldwide.
• Working with logs and timestamps — server logs are usually UTC; convert to your local time before debugging.

• Using ambiguous abbreviations. "CST" could be Central Standard Time (UTC−6) or China Standard Time (UTC+8). Use IANA names like America/Chicago or Asia/Shanghai.
• Forgetting DST shifts. The US, EU, and Australia change DST on different dates. There are two-week windows each year when the usual offset is wrong by an hour.
• Ignoring half-hour and quarter-hour zones. India is UTC+5:30, Nepal is UTC+5:45, and parts of Australia use UTC+9:30. Plain hour math fails.
• Not handling date rollover. Conversions across the Pacific frequently cross midnight; always confirm the target date as well as the time.
• Using city names that map to multiple zones. Indiana, Australia, and Brazil have multiple time zones inside one country — pick the specific city, not the country.