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About Timezzon
Timezzon is a free world clock, timezone converter, meeting planner, and public holiday reference built for anyone who works, travels, or communicates across time zones. It runs on server-anchored time not your device clock so the time shown is always accurate to the second.
How it works
Time source
Every city page renders a UTC timestamp from the server at build or request time. The browser receives that anchor and ticks forward using performance.now() drift never the device clock, which can be wrong or manipulated. A background re-sync from /api/now runs every five minutes to correct any accumulated drift.
Timezone data
All timezone rules come from the IANA tz database via the Luxon library. This is the same database used by operating systems, browsers, and most programming languages. DST transitions, historical offsets, and future rule changes are all handled automatically no manual offset tables.
NTP-synced server clock
The source of truth is the server, not the visitor's device.
IANA timezone database
DST rules and offsets are always up to date via Luxon.
Static-first caching
Most pages are generated at build time so crawlers get fast pages without causing extra writes.
No account required
Every tool works immediately no login, no API key, no tracking.
What's included
World Clock
Live local time for major cities worldwide, updated every second from a server-anchored timestamp.
Time Zone Converter
Convert any time between two cities with full DST awareness. Pick a date and see the exact offset that applies.
Meeting Planner
Add up to five cities and instantly see a 24-hour overlap board. Highlights work hours, edge hours, and sleep hours for each location.
City Time Pages
Dedicated pages for thousands of cities with live clocks, timezone details, DST status, and popular conversion links.
Public Holidays
National and regional holiday calendars for over 50 countries, useful for scheduling calls, launches, and travel.
Clock Widgets
Embeddable live clock widgets for any website. Ten design styles, light and dark themes, configurable city and seconds display.
Timezone Reference
Explanations of common timezone abbreviations UTC, GMT, EST, BST, JST and more with example cities and DST notes.
Common questions
How accurate is the time shown?
City pages and the world clock are anchored to the server clock at render time, then ticked forward in the browser using performance.now() drift. A background re-sync from /api/now runs every five minutes to correct any drift. The server clock is synced via NTP, so accuracy is typically within a second.
What timezone database does Timezzon use?
All timezone calculations use the IANA timezone database (tz database) via the Luxon library. This is the same database used by most operating systems, browsers, and programming languages, and it is updated whenever timezone rules change worldwide.
Why do some city pages say "noindex"?
Timezzon uses a gradual SEO rollout strategy. The full city database is available to users immediately, but only a curated set of cities is submitted to search engines at a time. This prevents thousands of thin pages from being indexed before they have enough content and internal links to rank well. Unpromoted pages are served normally but carry a noindex tag until they are promoted.
Does Timezzon handle Daylight Saving Time correctly?
Yes. Because Timezzon uses the IANA timezone database and Luxon, DST transitions are handled automatically per city and per date. The converter and meeting planner both apply the correct offset for the specific date you select, not a fixed annual average.
Is there a browser extension?
Yes. The Timezzon Chrome extension adds a popup world clock, a badge clock, and Smart Time Detection which highlights written times on webpages and shows a conversion tooltip.
How do I embed a clock widget on my website?
Go to the Widgets page, choose a city, pick a design and theme, then copy the one-line script tag. The widget loads from Timezzon and updates live. No account or API key is needed.
Contact
For questions, feedback, or partnership enquiries, email [email protected]. For privacy-related questions, see the Privacy Policy.