Where every number comes from.

Primary sources per country.

• 01Indonesia — SKB 3 Menteri (joint decree from the Ministers of Religion, Manpower, and PAN-RB) issued at the end of each year.
• 02United States — Office of Personnel Management (OPM) Federal Holidays.
• 03United Kingdom — UK Government Bank Holidays API (gov.uk).
• 04Japan — Naikaku-fu Cabinet Office National Holidays CSV.
• 05China, Hong Kong, Singapore, Malaysia — annual official government announcements.
• 06180+ other countries — official government collections, cross-checked with multiple international sources.

How we compute bridge days.

Our algorithm takes every national holiday plus joint-leave days in a year, then finds the minimum combination of paid leave that produces a continuous ≥3-day break. Results recalibrate after any official decree.

IANA Time Zone Database (tzdata).

The world clock and date calculator use the latest tzdata, mirrored from iana.org. Updated automatically on each new release (typically 2–4× per year).

Free to use, attribute fairly.

Our holiday data is published under CC BY 4.0. Free for commercial and non-commercial use as long as you credit "Source: caldays.com" with a back-link.