Check Gregorian leap years and list every year in a bounded range with the actual divisibility rule.
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All inputs stay in this page. No uploads or application history. Input edits invalidate generated outputs. Numeric quick sliders never clamp wider exact fields. Gregorian years 1–9999; a range contains at most 400 inclusive years. Leap if divisible by 4, except centuries unless divisible by 400. This is a proleptic Gregorian check, not a historical regional calendar lookup. Calculation worker deadline: 10 seconds.
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Your dates, clock settings and calendar labels stay on your device. Self-hosted browser code processes the inputs without uploads, accounts or application history. Browser time-zone rules and your device clock are used without remote lookup.
Gregorian years 1–9999; a range contains at most 400 inclusive years. Leap if divisible by 4, except centuries unless divisible by 400. This is a proleptic Gregorian check, not a historical regional calendar lookup.
No. Timers/clocks run only in the active browser page or workspace panel. Closing, Reset or switching tools releases that session. Background throttling and device sleep can delay feedback, and device-clock adjustments affect wall-clock timers. No notification permission, service worker or server alarm is used.
No. Weekend/holiday rules are supplied by you; no regional legal calendar is inferred. Time-zone calculations use the browser’s installed rules. The Meeting planner rejects skipped local times and requires an explicit occurrence for repeated times.
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