Exact time refers to time synchronized with atomic clocks, which are the most accurate timekeeping devices available. Our website displays time that is synchronized with official atomic clock time sources, providing accuracy within 0.02-0.10 seconds. This ensures you get the most precise time available.

UTC (Coordinated Universal Time) and GMT (Greenwich Mean Time) are often used interchangeably, but there is a subtle difference:

• GMT is a time zone based on the mean solar time at the Royal Observatory in Greenwich, London.
• UTC is a time standard based on atomic clocks and is more precise. It replaced GMT as the international time standard.
• For practical purposes, UTC and GMT are the same (UTC+0), but UTC is the preferred term in technical contexts.

Unix time (also called Epoch time or POSIX time) is a system for describing a point in time as the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It's commonly used in computer systems and programming. For example, a Unix timestamp of 1704067200 represents a specific moment in time.

Daylight Saving Time (DST) is the practice of setting clocks forward by one hour during warmer months to extend evening daylight. Our website automatically adjusts for DST based on your selected time zone. Most regions in North America and Europe observe DST, typically:

• Spring forward: Clocks move forward 1 hour (usually March/April)
• Fall back: Clocks move back 1 hour (usually October/November)

Not all countries observe DST - for example, most of Asia and Africa do not use daylight saving time.

You can use our time zone converter by:

1. Searching for a city or time zone in the search box
2. Selecting the desired location
3. The clock will automatically display the exact time for that time zone
4. You can compare times by viewing UTC, GMT, and Unix time formats

Our world clock supports 100+ cities and all major time zones worldwide.

A time zone offset is the difference in hours and minutes between a specific time zone and UTC (Coordinated Universal Time). For example:

• New York (EST): UTC-5 (5 hours behind UTC)
• London (GMT): UTC+0 (same as UTC)
• Tokyo (JST): UTC+9 (9 hours ahead of UTC)

Time zone offsets can change due to daylight saving time adjustments.

Our time is synchronized with atomic clock time sources, providing accuracy within 0.02-0.10 seconds. The time updates every second and is based on official time standards. This level of accuracy is suitable for most purposes, including scheduling, coordination, and general time reference.

ISO 8601 is an international standard for representing dates and times. It uses the format: YYYY-MM-DDTHH:MM:SS.sssZ. For example, "2024-01-01T12:00:00.000Z" represents January 1, 2024, at 12:00:00 UTC. The "Z" indicates UTC time. This format is widely used in computing, data exchange, and international communication.

Yes! Our website is fully responsive and optimized for mobile devices, tablets, and desktops. All features including the live clock, time zone search, and time format displays work seamlessly on any device size.

Simply use the search box at the top of the page. Type the name of any city (e.g., "New York", "London", "Tokyo") and select it from the results. The clock will immediately update to show the exact time for that location. We support 100+ major cities worldwide.