World Clock - Current Time Around the World

Q: How do time zones work?

The Earth rotates 360 degrees in 24 hours, so each 15 degrees of longitude roughly corresponds to one time zone. Countries may adopt a single national time or use multiple zones. Time zone boundaries often follow political borders.

Q: What is daylight saving time?

Daylight Saving Time is the practice of advancing clocks by one hour during the warmer months so that darkness falls at a later clock time. Most of Europe, North America, and parts of Australia observe DST.

Date & Time

World Clock (Multiple Time Zones)

Last updated: July 11, 2026

See the current time in multiple time zones simultaneously. Perfect for international teams, travelers, and remote workers.

Understanding Time Zones

Time zones are regions of the Earth that observe a uniform standard time. They are generally offset from Coordinated Universal Time (UTC) by whole hours, though some zones differ by 30 or 45 minutes.
UTC (Coordinated Universal Time) is the successor to Greenwich Mean Time (GMT) and serves as the global time reference. All time zones are expressed as offsets from UTC, e.g., UTC+8 for Beijing or UTC−5 for New York Eastern Time.
Daylight Saving Time (DST) shifts clocks forward by one hour during warmer months to extend evening daylight. Not all regions observe DST — most of the tropics do not, while North America, Europe, and parts of Asia and Oceania do.
IANA time zones (e.g., America/New_York) are the modern standard used by operating systems and browsers. They encode both the standard offset and all historical DST transitions, so Intl.DateTimeFormat always gives the correct current time.

How This Tool Works

This world clock uses the browser’s built-in Intl.DateTimeFormat API with IANA time zone identifiers. Each card queries the system clock once per second and formats the result for the specified zone, accounting for DST automatically.

Example:

When it is 12:00 PM (noon) in London (UTC+0), it is 7:00 AM in New York (UTC−5 during EST) or 8:00 AM during EDT (UTC−4).

Adding cities:

Use the dropdown above the clock grid to add up to 20+ additional cities. Click the × on any card to remove it.

Frequently Asked Questions

What is UTC time?

UTC stands for Coordinated Universal Time. It is the primary time standard by which the world regulates clocks. UTC is defined by atomic clocks and does not change with seasons. All civil time around the world is based on UTC offsets — for example, UTC+8 for Beijing or UTC−5 for New York.

How do time zones work?

The Earth rotates 360° in 24 hours, so each 15° of longitude roughly corresponds to one time zone. The International Date Line (180°) divides one calendar day from the next. Countries may adopt a single national time or use multiple zones. Time zone boundaries often follow political borders rather than strict longitude lines.

What is daylight saving time?

Daylight Saving Time (DST) is the practice of advancing clocks by one hour during the warmer months so that darkness falls at a later clock time. Most of Europe, North America, and parts of Australia observe DST. Countries near the equator generally do not, since daylight duration varies little throughout the year. The IANA timezone database encodes DST rules for every region.