Time Utilities

World Clock

Show current time in multiple timezones at once.

UTC
--:--:--
UTC
Beijing
--:--:--
Asia/Shanghai
Tokyo
--:--:--
Asia/Tokyo
New York
--:--:--
America/New_York
Los Angeles
--:--:--
America/Los_Angeles
London
--:--:--
Europe/London
Paris
--:--:--
Europe/Paris
Sydney
--:--:--
Australia/Sydney

What is World Clock?

World clock displays current time across multiple cities and time zones simultaneously.

Features

  • Multiple city display
  • Real-time updates
  • Customizable city list

Use Cases

  • Global team coordination
  • International business
  • Travel planning

Frequently Asked Questions

Why are some timezones offset by half an hour?
About 40 regions use non-whole-hour offsets: India +05:30, Iran +03:30, Nepal +05:45 (the world’s only 45-minute offset). These are historical and political choices, not geography — never assume "all timezones are whole hours" when working with South Asia.
Why prefer "Asia/Shanghai" over "UTC+8"?
A fixed offset carries no DST rules: America/New_York swings between -5 and -4 across the year, so a hard-coded UTC-5 is wrong for half the year. IANA zone names (Asia/Shanghai, America/New_York) encode the full history and rules — the correct choice for code and configuration.
How do I run meetings across continents?
Rotate the sacrifice (this quarter Asia wakes early, next quarter Europe stays late); anchor on UTC rather than one person’s local time so DST switches do not silently move the meeting; confirm everyone’s local time on the world clock, with extra care during DST transition weeks.