Data sources and methodology
How the site turns structured geographic data into country-specific clocks, calendars and planning tools.
Time and UTC offsets
Live clocks use the browser’s Intl implementation with named IANA time zones. Date-specific conversion converts a local wall-clock time into an instant and then formats that instant in the destination time zone.
Daylight saving time
Static explanatory DST facts are generated from the host system’s IANA time-zone database. Live clocks calculate the active offset in the visitor’s browser, so they do not depend on a hard-coded “summer” or “winter” offset.
Public holidays
Holiday lists use the Nager.Date holiday API. Its data model can distinguish national from regional dates and can include holiday types such as Public, Bank, School and Observance. Regional coverage differs by country.
Sunrise, sunset and weather
City pages request solar and current weather data from Open-Meteo using the city coordinates stored in the site dataset. Weather data does not affect the clock calculation.
Working days
The working-days calculator removes the selected country’s typical weekend days and public holidays returned by the holiday dataset. Employment contracts, local government rules and regional holidays can differ, so the result is a planning estimate rather than legal advice.