Live global comparison
World clock
Your cities and their order are remembered. Dates are compared with the first city.
Add and compare time zones with live local times, UTC offsets, and clear previous- or next-day labels.
Standards-based time zones
World times use the browser’s Intl implementation and IANA time zone identifiers. Daylight-saving rules and historical offset changes are not manually hardcoded.
Your locations
Add the cities where your colleagues, friends or family live. Search by a city such as Seoul, New York or London, or choose an IANA zone from the list. Move your home city to the top: day differences use it as the reference. Your list is ready when you return.
Questions & Answers
Frequently Asked Questions
Does the world clock show a future meeting time?
It compares the current instant across locations. Use the time zone converter for a meeting on a particular future date.
Why does the time difference change during the year?
Some locations change their UTC offset for daylight saving time. The world clock uses the time-zone rules supplied by your browser.
Can I search using CST or another abbreviation?
Use a city or IANA identifier such as America/Chicago. Abbreviations can refer to different regions and are not a safe choice.
How can I keep the same cities next time?
Your selected cities and their order are saved in this browser when local storage is available. They do not sync to other browsers.