Legal
Attributions & Licences
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The Global Clock is built on open data and open-source software. This page credits those sources — both because several of their licences require visible attribution, and because the people who maintain them deserve the credit.
Data sources
- GeoNames
- City names, coordinates, populations, and administrative regions come from the GeoNames geographical database, used under the Creative Commons Attribution 4.0 licence.
- IANA Time Zone Database
- Time-zone boundaries, UTC offsets, and daylight-saving rules come from the IANA Time Zone Database (the “tz database”), which is in the public domain.
- Unicode CLDR
- Time-zone display names and other locale data come from the Unicode Common Locale Data Repository (CLDR), used under the Unicode licence.
- OpenStreetMap & Protomaps
- The maps on city pages are rendered from OpenStreetMap data © OpenStreetMap contributors, available under the Open Database Licence (ODbL), packaged as planet tiles by Protomaps.
- Timezone Boundary Builder
- The time-zone polygons drawn on the world map are derived from timezone-boundary-builder, which is built from OpenStreetMap data and distributed under the Open Database Licence (ODbL).
- WeatherAPI.com
- Weather forecasts shown on city pages are provided by WeatherAPI.com, used under their terms of service.
Imagery
- Skyline illustration
- The city-skyline artwork is designed by Freepik.
Software
The site is made possible by a long list of open-source projects, including Astro, Svelte, Tailwind CSS, and MapLibre, and is hosted on Cloudflare. Our thanks to everyone who maintains them.
Reusing this data
If you reuse data that originates from the sources above, the original licence still applies — for example, ODbL and Creative Commons Attribution data must keep their attribution and share-alike terms. Please credit the original source, not just The Global Clock. See the Terms of Use for more on acceptable use.
Something missing?
If you think a source is missing or miscredited here, please let us know through the contact page and we'll fix it.