frequently asked questions
Quick answers to the questions people ask most about time, synchronization and the tools on Time.is.
Q:Where does Time.is get its accuracy from?
Time.is synchronizes with stratum-1 atomic time servers. When you open the page your browser takes round-trip measurements to compensate for network latency and pin down the exact instant.
Q:Why is my computer’s clock wrong?
The quartz oscillator inside a computer, phone or motherboard drifts with temperature and component quality — several seconds a day without continuous NTP synchronization.
Q:Which time formats does Time.is support?
You can switch freely between 24-hour (14:30) and 12-hour AM/PM (2:30 PM), show or hide seconds, and choose between a modern sans-serif and a monospace clock face.
Q:How do I convert time between cities?
Use the Time Converter and Meeting Planner at /converter to compare a 24-hour timeline across any set of places in the world.
Q:How is daylight saving time (DST) kept up to date?
Time zone rules and DST transitions follow the latest IANA Time Zone Database, so the site is correct as soon as a country changes its law.
Q:Can I embed a Time.is clock on my own site?
Yes — visit /widgets to generate custom HTML embed code for your site or blog.
Still have a question?
Our support team answers questions and takes bug reports.