Does this converter account for daylight saving time?

Yes. This converter uses the browser's built-in Intl.DateTimeFormat API with IANA time zone identifiers (like 'America/New_York'). These automatically account for daylight saving time based on the exact date you enter. If you convert a date in summer versus winter, the offset will differ for regions that observe DST.

How do I convert time zones manually?

Determine both UTC offsets. Subtract the source offset and add the target offset. For example, to convert 3:00 PM New York (UTC-5) to Tokyo (UTC+9): 15:00 + 5 (to get UTC) + 9 (to get Tokyo) = 29:00 = 5:00 AM next day in Tokyo. This tool handles these calculations automatically.

Time Zone Converter - Convert Time Between Cities

Q: How do time zones work?

Time zones divide the world into regions that observe a uniform local time, usually offset from Coordinated Universal Time (UTC) by whole or half hours. The offset is written as UTC+X or UTC-X. For example, New York is UTC-5 (or UTC-4 during daylight saving time), and Tokyo is UTC+9 year-round.

Q: What is UTC and how is it different from GMT?

UTC (Coordinated Universal Time) is the primary international time standard. GMT (Greenwich Mean Time) is a time zone that equals UTC+0. They are often used interchangeably, but technically UTC is the standard and GMT is a time zone. UTC never observes daylight saving time, making it a stable reference point.

Q: What time zone does India use?

India uses a single time zone: Indian Standard Time (IST), which is UTC+5:30. This unusual 30-minute offset means India is 5.5 hours ahead of UTC. Unlike most countries, India does not observe daylight saving time, so the offset stays constant year-round.

What Is a Time Zone Converter?

A time zone converter translates a date and time from one location's local time to another's. It is essential for scheduling international meetings, tracking global events, calculating when something happens in your local time, and understanding when to call someone in another country. The world is divided into time zones that offset from Coordinated Universal Time (UTC) by whole or half hours.

How to Use This Time Zone Converter

Select the source time zone from the From dropdown and enter the date and time you want to convert. The converted time appears instantly in the To panel. Change the destination time zone in the right dropdown to convert to a different location. Click the ⇄ swap button to reverse the direction of conversion.

The converter displays the converted time, full date, and UTC offset — including daylight saving adjustments for the exact date entered.

How Time Zone Conversion Works

This converter uses the browser's built-in Intl.DateTimeFormat API with IANA time zone identifiers (e.g. America/New_York, Asia/Tokyo). The IANA time zone database is the global standard, containing historical and current offset data for every region including daylight saving transitions. The conversion steps are:

Parse the input datetime string as a UTC moment.
Render that moment in the target time zone using Intl.DateTimeFormat.
Display the UTC offset for the target zone on that specific date.

World Time Zone Reference

City / Region	IANA Zone	Standard Offset
New York	America/New_York	UTC−5 (EDT: UTC−4)
London	Europe/London	UTC+0 (BST: UTC+1)
Paris / Berlin	Europe/Paris	UTC+1 (CEST: UTC+2)
Dubai	Asia/Dubai	UTC+4 (no DST)
Mumbai / Delhi	Asia/Kolkata	UTC+5:30 (no DST)
Singapore	Asia/Singapore	UTC+8 (no DST)
Tokyo	Asia/Tokyo	UTC+9 (no DST)
Sydney	Australia/Sydney	UTC+10 (AEDT: UTC+11)

Frequently Asked Questions

How do time zones work?

Time zones offset local time from UTC by whole or half hours. Most of the world uses whole-hour offsets; India (UTC+5:30), Nepal (UTC+5:45), and a few others use non-standard offsets. UTC itself never changes, but local offsets may shift seasonally due to daylight saving time.

What is UTC and how is it different from GMT?

UTC (Coordinated Universal Time) is the international time standard used as the reference for all offsets. GMT (Greenwich Mean Time) is the time zone at UTC+0. They are numerically equal, but technically UTC is an atomic-clock-based standard while GMT is a time zone definition. UTC never observes daylight saving time.

Does this converter handle daylight saving time?

Yes. Using IANA time zone identifiers with Intl.DateTimeFormat automatically applies the correct DST rules for the exact date entered. Summer dates will show summer offsets (e.g. New York at UTC−4) while winter dates show standard offsets (UTC−5).

How do I manually convert time zones?

Subtract the source UTC offset, then add the destination offset. Example: 3:00 PM New York (UTC−5) to Tokyo (UTC+9): 15:00 + 5 = 20:00 UTC, + 9 = 05:00 next day Tokyo. This tool handles all calculations automatically.

What time zone does India use?

India uses Indian Standard Time (IST) = UTC+5:30, a single time zone for the entire country. India does not observe daylight saving time, so the offset is constant year-round.