A time zone is a region of the globe that observes a uniform standard time for legal, commercial, and social purposes. Time zones are based on longitudinal offsets from Coordinated Universal Time (UTC). Most time zones are offset from UTC by a whole number of hours, though some use half-hour or quarter-hour offsets.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks and time. It is not adjusted for daylight saving time and serves as the reference point for all other time zones. For example, IST (India Standard Time) is UTC+5:30, meaning it is 5 hours and 30 minutes ahead of UTC.

How do I calculate time zone differences?

This converter automatically calculates time differences using the browser's built-in Intl.DateTimeFormat API with IANA time zone identifiers. You don't need to manually calculate offsets—simply select your source and target time zones and the tool does the rest.

Does this converter account for daylight saving time?

Yes! The converter uses IANA time zone identifiers (like America/New_York, Europe/London) which automatically account for daylight saving time (DST) changes. The browser's date/time API handles DST transitions, so conversions are accurate year-round.

Why does the time update every second in Current Time mode?

In Current Time mode, the converter updates every second to show the live current time in both selected time zones. This makes it useful as a world clock to see what time it is right now in different parts of the world.

What is the Custom Time mode used for?

Custom Time mode lets you enter a specific date and time to see what it would be in a different time zone. This is useful for scheduling meetings, planning calls, or checking what time a past or future event occurs in another timezone. For example, if a meeting is at 2:00 PM EST, you can see what time that is in IST.

Which time zones are supported?

This converter supports 12 major time zones including UTC, India (IST), USA time zones (Eastern, Pacific, Central), UK (London), Europe (Berlin, Paris), Asia (Tokyo, Dubai, Singapore), and Australia (Sydney). These cover the most commonly used time zones worldwide.

Time Zone Converter - Convert Time Across Time Zones - 100+ Tools

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How to Use Time Zone Converter

How to Use the Time Zone Converter: 1. Choose Mode - Current Time: Shows live current time - Custom Time: Enter a specific date and time - Toggle between modes using the buttons 2. Select "From" Time Zone - Choose the original time zone - Supports major time zones worldwide - UTC, IST, EST, PST, JST, and more 3. Select "To" Time Zone - Choose the target time zone - See instant conversion - Updates live for current time mode 4. View Results - From zone shows in blue card - To zone shows in purple card - Both display date and time clearly 5. Custom Time (Optional) - Switch to "Custom Time" mode - Use datetime picker to select specific time - Time treated as absolute instant - Converts to both time zones 6. Swap Time Zones - Click "Swap Time Zones" button - Instantly reverses from/to zones - Useful for quick comparison 7. Try Examples - India → USA: See IST to EST conversion - UK → Japan: Compare London to Tokyo time - Sydney → London: Check Australia to UK time 8. Copy Results - Copy button saves both times - Includes timezone labels - Easy to share or save Supported Time Zones: • UTC (Coordinated Universal Time) • India — IST (Asia/Kolkata) • USA — Eastern (America/New_York) • USA — Pacific (America/Los_Angeles) • USA — Central (America/Chicago) • UK — London (Europe/London) • Europe — CET (Europe/Berlin) • France — Paris (Europe/Paris) • Japan — JST (Asia/Tokyo) • UAE — Dubai (Asia/Dubai) • Singapore (Asia/Singapore) • Australia — AEST (Australia/Sydney)