{"id":"century-leap-year-rule-tested","text":"The `day-of-the-year` test suite covers both the century non-leap case (1900) and the 400-year leap case (2000), exercising the two most commonly missed leap-year edge cases.","truth_value":"IN","source":"entries/2026/06/06/day-of-the-year-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"century-leap-year-rule-tested","truth_value":"IN","reason":"premise"}]}}