Frequently Asked Questions
How many cities does the world clock support?
Supports 20+ major cities and time zones worldwide, covering important cities in Asia, Europe, Americas, and Oceania, including Beijing, Tokyo, New York, London, Paris, Sydney, etc.
Is the time accurate?
The time is based on your device's system time. Ensure correct time for accurate display. We recommend enabling automatic time sync on your device.
What is UTC time?
UTC (Coordinated Universal Time) is the international standard time and basis for global time zone calculations. Beijing time is UTC+8, meaning 8 hours ahead of UTC; New York is UTC-5 (winter) or UTC-4 (summer).
Why does some city time differ from expected?
This may be due to daylight saving time. Some countries (like the US and most of Europe) adjust clocks during certain seasons, typically advancing by one hour in spring and reverting in fall.
Can I add custom cities?
Custom city addition is not supported yet. Currently displays preset major cities worldwide, covering most commonly used regions. Use the search function to quickly locate cities in nearby timezones.
Is this tool really free? Is it safe?
Yes, this tool is 100% free with no ads, no signup, no usage limits, and no watermarks. All processing happens in your browser — your data never leaves your device. It's completely safe and private.