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🌍 Time Zone Calculator

Convert any date and time between 35+ major time zones worldwide. Handles Daylight Saving Time automatically using your browser's built-in timezone support.

How Time Zone Conversion Works

This calculator uses the browser's built-in Intl.DateTimeFormat API with IANA timezone identifiers (e.g. America/New_York). Daylight Saving Time transitions are handled automatically.

Convert date+time → UTC → Re-format in target timezone

How to Convert Time Zones

  1. 1
    Select Date & Time
    Choose the date and time you want to convert. Defaults to right now.
  2. 2
    Choose "From" Time Zone
    Select the time zone the original date/time is in.
  3. 3
    Choose "To" Time Zone
    Select the destination time zone you want to convert to.
  4. 4
    Click Convert
    See the converted time, date, and the hour difference between the two zones.

Real-World Example

A meeting at 9:00 AM New York (ET) — what time is that in Mumbai?

New York (EST, UTC−5): 9:00 AM
UTC time: 2:00 PM
Mumbai (IST, UTC+5:30): 7:30 PM
Difference: +10 hours 30 minutes
'Why does the time difference sometimes have 30 minutes?', 'answer' => 'Some countries use half-hour UTC offsets. India (IST) is UTC+5:30, and Nepal is UTC+5:45. This is a deliberate historical or political choice to align the country to a single time zone while remaining close to solar time.'], ['question' => 'Can I use this for scheduling international meetings?', 'answer' => 'Yes! Enter the proposed meeting date and time in your local time zone, select your zone as "From" and the other participant\'s zone as "To". The converter will show exactly what time it will be for them, including any DST adjustments.'], ]" />

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