How do I add a city to the world clock?

Type a city name in the search box and select from the dropdown of available time zones. The city card will appear instantly showing the current local time, date, UTC offset, and day/night status.

How does the meeting planner work?

The meeting planner shows a 24-hour visual timeline for each city you have added. Work hours (9 AM to 5 PM) are highlighted in color, and off-hours are dimmed. Look for vertical bands where multiple cities' work hours overlap to find the best time for a group call.

Does the world clock account for daylight saving time?

Yes. The world clock uses the browser's built-in Intl API, which automatically handles daylight saving time transitions for every time zone. The displayed times are always accurate to the current DST status.

World Clock - ClockTools.com

Meeting Planner - 24 Hour Timeline

Add cities to see meeting overlap and working hours

Free Online World Clock

The ClockTools World Clock displays the current time in multiple cities and time zones simultaneously, updated every second. It is designed for distributed teams, international travelers, and anyone who needs to track time across the globe. Add as many cities as you need, see each one's current time, date, UTC offset, and whether it is currently daytime or nighttime.

Real-Time, Zero-Dependency Time Zone Data

Unlike world clocks that rely on external APIs or databases, ClockTools uses the browser's built-in Intl.DateTimeFormat API to calculate and display every time zone. This means the times are always accurate, daylight saving transitions are handled automatically, and the clock works even without an internet connection after the page loads. There are no API rate limits, no subscription required, and no data sent to any server.

Meeting Planner for Distributed Teams

The built-in Meeting Planner displays a 24-hour visual timeline for every city you have added. Each city's standard work hours (9 AM to 5 PM) are highlighted, while off-hours are dimmed. Scan the timeline to find windows where two or more cities' work hours overlap - these are your ideal meeting slots. This is especially valuable for teams spread across continents where finding a mutually acceptable time can otherwise require tedious mental math and timezone conversion.

Day and Night at a Glance

Each city card includes a sun or moon icon indicating whether it is currently daytime or nighttime at that location, based on a simple 6 AM to 6 PM daylight approximation. Combined with the "relative to you" offset (e.g., "+8 hours from you"), you can quickly assess whether it is appropriate to call or message someone in another time zone.

Common Uses

Remote workers use the world clock to keep their distributed colleagues' times visible throughout the workday. International sales teams use it to time outreach during prospects' business hours. Travel planners use it to check destination times before booking flights or calls. Families spread across countries use it to find good times to video chat. Project managers with offshore teams use the meeting planner to schedule standups and reviews at times that work for everyone.

World Clock