World Clock

A world clock displays the current time across multiple cities and time zones simultaneously. It is an essential tool for anyone who works, communicates, or travels internationally. Instead of mentally calculating time differences or searching "what time is it in Tokyo," a world clock shows everything at a glance.

Our world clock lets you add cities from around the globe and see their current local time updated in real time. The display shows each city's time zone offset from UTC, whether daylight saving time is active, and the time difference relative to your location.

In an increasingly connected world, time zone awareness is not optional — it is a professional necessity. Remote teams, international businesses, and global families all need reliable time zone references. Our world clock provides that reference instantly, for free, in your browser.

Our world clock is designed for effortless time zone comparison. You can set it up in seconds and start tracking cities around the world.

Getting started:

1. Open the world clock
2. Your local time zone is detected and displayed automatically
3. Use the search bar to find and add cities by name
4. Added cities appear in a clean list with their current local time
5. Compare times at a glance across all your selected cities
6. Remove cities you no longer need with one click

The tool remembers your city selections between visits, so you only need to set it up once. For travelers, you can update your list before each trip to track the time back home and at your destination.

Pair the world clock with our online clock for a detailed view of your local time, or use the alarm clock to set wake-up alarms that account for your travel schedule.

Time zones divide the Earth into 24 primary regions, each offset by one hour from its neighbors, based on the concept that the Earth rotates 15 degrees of longitude per hour. The reference point is UTC (Coordinated Universal Time), formerly known as GMT (Greenwich Mean Time).

Key concepts:

• UTC offsets range from UTC-12 to UTC+14. For example, New York is UTC-5 (standard) or UTC-4 (daylight saving), while Tokyo is UTC+9.
• Half-hour and quarter-hour zones exist in some regions. India uses UTC+5:30, Nepal uses UTC+5:45, and parts of Australia use UTC+9:30.
• The International Date Line runs through the Pacific Ocean. Crossing it changes the calendar date by one day.
• Some countries span multiple time zones. The United States has six, Russia has eleven, and France has twelve when counting overseas territories.

Our world clock handles all of these complexities automatically, displaying the correct local time for every city regardless of its offset or daylight saving status.

Daylight Saving Time (DST) is the practice of advancing clocks by one hour during warmer months to extend evening daylight. Not all countries observe DST, and those that do change their clocks on different dates, making international time coordination particularly challenging during transition periods.

Important DST facts:

• Spring forward, fall back: Clocks advance one hour in spring and revert in autumn
• Northern Hemisphere countries typically observe DST from March to November
• Southern Hemisphere countries observe from September to April (reversed seasons)
• Notable non-participants: Most of Asia, Africa, and South America do not use DST. Arizona and Hawaii in the US also opt out.
• Transition confusion: During the two weeks when some countries have changed and others have not, time differences between cities temporarily shift

Our world clock tracks DST changes automatically for every city. You never need to manually adjust offsets — the displayed times are always accurate, even during transition periods.

One of the most practical uses of a world clock is finding suitable meeting times across multiple time zones. Without a visual reference, scheduling a call between London, New York, and Singapore can involve frustrating back-and-forth calculations.

Tips for international scheduling:

• Add all participant cities to the world clock and look for overlapping business hours
• Aim for the 14:00-17:00 UTC window — this often catches morning in the Americas, afternoon in Europe, and evening in Asia
• Rotate meeting times for regularly recurring calls so no single region always has the inconvenient slot
• Account for DST transitions by checking the world clock the week before scheduling, as offsets may have changed
• Use our countdown timer to display a live countdown to the meeting start for all participants

For teams spread across more than three time zones, consider asynchronous communication supplemented by occasional live calls during the best available overlap window.

Our world clock supports hundreds of cities, but certain time zones and cities are searched more frequently than others. Here are the most commonly tracked locations.

Major time zones:
- EST/EDT (UTC-5/-4): New York, Toronto, Miami, Washington D.C.
- CST/CDT (UTC-6/-5): Chicago, Dallas, Mexico City
- PST/PDT (UTC-8/-7): Los Angeles, San Francisco, Seattle, Vancouver
- GMT/BST (UTC+0/+1): London, Dublin, Lisbon
- CET/CEST (UTC+1/+2): Paris, Berlin, Rome, Madrid, Amsterdam
- IST (UTC+5:30): Mumbai, Delhi, Bangalore
- CST (UTC+8): Beijing, Shanghai, Singapore, Hong Kong, Taipei
- JST (UTC+9): Tokyo, Osaka, Seoul
- AEST/AEDT (UTC+10/+11): Sydney, Melbourne, Brisbane

All of these cities and many more can be added to your personalized world clock dashboard for instant time comparison.

Beyond displaying current times, our world clock functions as a practical time zone converter. When you need to know what 3:00 PM in London translates to in Tokyo or what 9:00 AM in New York means for your colleague in Sydney, the answer is instantly visible.

How to use it as a converter:

1. Add the source and target cities to your world clock
2. Note the current time in each city
3. Calculate the difference between them — this offset stays constant (except during DST transitions)
4. Apply that offset to your target time

For example, if London shows 14:00 and New York shows 09:00, the difference is 5 hours. So a 16:00 London meeting would be 11:00 in New York.

For precise time arithmetic beyond simple conversion, our time calculator can add and subtract hours, minutes, and seconds. And for date-based planning, the date calculator computes durations between any two dates.

An online world clock is the fastest, most reliable way to check times across the globe. Here is why our tool is the preferred choice for thousands of daily users.

Key advantages:

• Real-time accuracy: All times update live, including automatic DST adjustments
• Customizable city list: Add only the cities you care about for a clean, focused display
• Persistent memory: Your selected cities are saved between sessions
• Instant comparison: See multiple time zones side by side without any calculation
• Free and accessible: No app download, no account, works on any device with a browser
• Professional quality: Clean interface suitable for office displays and presentation screens

Physical multi-zone clocks are expensive, limited to a few cities, and cannot adjust for DST automatically. Phone widgets offer similar functionality but take up home screen space. Our browser-based world clock gives you unlimited cities, automatic DST handling, and zero cost — the smartest option for staying time-zone aware.