Data Sources

Data Sources

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Workday/non-workday shading comes from public holiday data fetched directly by the browser. Data is cached per country in localStorage and refetched on the auto-update interval; the refresh icon in the heatmap sidebar updates immediately.

Sources

Country/region	Source	Notes
China	holiday-cn mirrors (jsDelivr, then raw.githubusercontent.com)	Public holidays, make-up workdays and adjusted weekends
Japan	holiday-jp	Cabinet Office holidays, substitute holidays and citizens' holidays
South Korea	holidays-kr	Includes substitute holidays
Russia	isdayoff.ru	Production calendar with transferred working days
Other countries	date.nager.at	Public holidays plus the local weekend rule

Fallback and cache

• If a dedicated source is unreachable, the board falls back to Nager.Date per year; the source name shown in the UI follows the data actually in use.
• The cache stores { years, fetchedAt, source } per country; caches without a source field are refreshed once.
• An embedded China snapshot for 2023–2026 keeps the board usable offline.

Status row

↻ China · 2026/10/26 · Holiday CN

Refresh icon (click to update now) · country · last refresh date (YYYY/MM/DD) · data source. Hover for the full status and shading rule.

Known limitations

• Data is national-level. Countries whose states/provinces differ (Germany, Canada, Australia, Spain, Switzerland, …) would need a subdivision selector, which is not implemented; only national public holidays are shown.
• Nager.Date currently has no dataset for the UAE, Saudi Arabia, Israel, Thailand, Malaysia or India, so those calendars fall back to the weekend rule only.
• State/province holidays in some countries (e.g. the US, UK) are not part of the national lists.

Privacy

• Only the browser requests the public CORS endpoints listed above.
• Results are cached locally in localStorage.
• No credentials, session contents or personal data are sent; the plugin has no telemetry.