Ultimate World Clock
The 3D world clock and meeting planner for teams across time zones
Free world clock with a live 3D globe showing real day and night, the sun and the moon. Compare time zones, find meeting times across cities and add them to your calendar.
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Live 3D globe and world map
See every city on a spinning 3D globe or a flat world map, with the real line between day and night updated as the minutes pass.
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Real sun and moon
Turn on the sun and moon to see exactly where each one is overhead right now, including today’s moon phase.
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Clocks for 7,000+ cities
Search any city, state or country and add it in a click. Show times in 24-hour, 12-hour AM/PM, or both at once.
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Follow a city
Lock the globe onto any city and watch its real daylight and darkness change through the day.
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Meeting planner for up to 4 cities
Instantly see which hours overlap for everyone, with each city’s own working hours and working days, weekends and daylight saving time included.
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Pick a date and an exact time
Choose any date and a meeting time like 9:15, plan it in any city’s time, and see at a glance whether it works for everyone.
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Add to your calendar
Send the meeting to Google Calendar or Outlook, download a calendar file, or copy a ready-made summary for email or chat.
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Free, private, no sign-up
Your cities and settings are remembered in your own browser. Nothing to install and no account needed.
Questions
How do I find a good meeting time across time zones?
Open the Meeting Booker, add up to three cities next to your home city and pick a date. Green hours are inside everyone’s working hours, and the best shared window is shown at the top.
Does Ultimate World Clock handle daylight saving time?
Yes. Every city’s local time is calculated for the exact date you pick, so daylight saving changes and half-hour time zones come out right.
Is the day and night on the globe real?
Yes. The sun and moon positions are calculated from the current time, so the lit half of the Earth, the sunset line and the moon phase match reality.
Is it free?
Yes. Ultimate World Clock is free to use, with no sign-up. Your settings stay in your own browser.