About 123Clock
World clock, time zones, calendar & time tools — free, fast and available to everyone, with no sign-up.
123Clock.online is a free collection of everyday time tools: a live world clock, a time zone converter, a calendar, sun, moon & season data, a timer and stopwatch, and a set of date calculators.
How it works
Every time is computed on the server and then corrected in your browser against an independent, CORS-enabled time source, so what you see does not depend on your device clock being right. If your own clock is off, we tell you by how much and how to fix it.
Locations, time zones and coordinates cover roughly 170,000 cities and towns worldwide, not just capitals, so small places are addressable too.
Our principles
- Free and open access. No accounts, no paywalls, no install.
- Privacy first. No tracking cookies; preferences stay in your browser. See our Privacy Policy.
- Accurate, but honest about limits. Astronomical values are computed with compact models and are accurate to within a few minutes — ideal for planning, not for navigation.
Get in touch
Questions, corrections or ideas are welcome — see the Contact us page.