About Exact Time Now
Exact Time Now is a free world-clock and time-zone reference for anyone who needs to know what time it is, anywhere on Earth, to the second.
Who runs it
The Site is built and maintained by Marcin Lewandowski — a product designer with two decades of experience across print, web, and digital products. Exact Time Now started as a personal tool for coordinating cross-time-zone work and grew into a public reference used by remote teams, travellers, traders, and developers.
How we keep time accurate
Every clock on the Site is rendered using the official IANA Time Zone Database, which is the global standard used by every major operating system and programming language. We refresh the dataset whenever IANA publishes a new release, so changes to daylight-saving rules (governments do this surprisingly often) are reflected within hours.
On every page load your browser is synchronised against the server clock, which itself is kept in step with NTP stratum-1 sources. In practice this means the second-hand you see on screen is accurate to within a few hundred milliseconds of UTC.
Where our data comes from
- Time-zone rules — IANA tz database.
- Public holidays — Nager.Date.
- Sunrise, sunset, golden hour — sunrisesunset.io.
- Weather — Open-Meteo.
- City geography and population — curated from public open datasets.
What you can do here
- Check the current local time in 100+ cities worldwide.
- Compare two cities side-by-side with hour-by-hour overlap.
- Plan a meeting across up to three locations.
- See public holidays by country.
- Track stock-exchange trading hours around the world.
- Build a shareable countdown to any future event.
Editorial approach
Articles on our blog are written or reviewed by the editorial team and based on first-hand experience coordinating real cross-time-zone teams. We do not publish AI-generated filler and we do not accept paid placements that aren’t clearly labelled.
Get in touch
Spot an error? Want to suggest a city? Email info@marcinlewandowski.com or use the contact page.