World Clock
Free world clock showing live time in multiple cities. Add any timezone, toggle 12h/24h format, and see day/night at a glance.
About World Clock
See the Time Around the World
This world clock shows the current time in multiple cities simultaneously, updating every second. It starts with six popular cities - London, New York, Tokyo, Sydney, Dubai, and Los Angeles - and you can add or remove any city from a list of over 50 worldwide timezones.
Visual Day and Night Indicators
Each clock card shows a sun or moon icon and changes its background to reflect whether it is daytime or nighttime in that city. Daytime cards have a warm amber background, while nighttime cards use a dark slate theme. This makes it easy to see at a glance who might be awake or asleep.
Flexible Time Format
Switch between 12-hour and 24-hour time formats with a single click. Each card also shows the current date and UTC offset, so you always know the full context. Need to convert a specific time between zones? Try the time zone converter. For calculating hours worked across time zones, the hours calculator can help.
The clock runs entirely in your browser using JavaScript's Intl API, with no external requests. Daylight saving time is handled automatically.
Frequently Asked Questions
How accurate is the world clock?
The clock uses your device's system time and the Intl.DateTimeFormat API to convert it to each timezone. It updates every second. As long as your device clock is correct, the times shown will be accurate, including daylight saving adjustments.
Can I add more cities?
Yes. Use the search box to find any city or timezone. The list includes over 50 major cities. Type a city name and click it to add a new clock card. You can add as many cities as you want.
What do the sun and moon icons mean?
The sun icon means it is daytime (between 6 AM and 8 PM local time) in that city. The moon icon means it is nighttime. The card background also changes to reflect day or night.
Can I switch between 12-hour and 24-hour time?
Yes. Click the "24h" or "12h" button at the top to switch between formats. The toggle applies to all cities at once.
Does the clock account for daylight saving time?
Yes. The clock uses the IANA timezone database built into modern browsers, which includes all daylight saving time rules. Times automatically adjust when DST changes occur.