Fristenkalender

How this deadline calendar stays exact

This Fristenkalender adds days, weeks, months or years with UTC-based math to avoid daylight-saving jumps. Business-day mode walks day by day and skips Saturday/Sunday, so a Friday plus one business day always lands on Monday. Month and year additions clamp to valid month-ends (31 Jan + 1 month becomes 28/29 Feb). Optional weekend shifting moves target dates to the next business day, and reminders can be calculated on business days as well. All inputs stay local; there are no API calls or storage.

Workflow: choose start date and duration, decide whether to count business days or calendar days, toggle weekend shift, add an optional reminder, label the deadline and save it. Each saved entry shows ISO dates, weekday labels, reminder, and whether the date was shifted. The summary highlights earliest and latest deadlines, weekend hits and shifted items. Because calculations are consistent (start day not counted, each step is one day), you avoid off-by-one errors for legal reply windows, warranty periods, billing cutoffs or project milestones.

Best practice: use business-day mode for legal, banking and office workflows; use calendar days for subscriptions or consumer cooling-off periods unless law states otherwise. Keep weekend shift on when filings cannot land on Saturday/Sunday. For audits, screenshot the summary with ISO dates. If you must include public holidays, add a manual offset or treat the holiday as weekend by adding one extra business day; this tool natively removes only weekends to stay deterministic offline.

FAQ

• Zaehlt der Starttag? Nein, der erste Schritt beginnt am Folgetag, damit Fristen konsistent bleiben.
• Werden Feiertage entfernt? Nein, nur Wochenende; fuege einen zusaetzlichen Werktag hinzu, wenn Feiertage relevant sind.
• Was passiert bei 31. + 1 Monat? Es wird auf das Monatsende geklemmt (28/29, 30 oder 31 je nach Zielmonat).
• Warum UTC? UTC verhindert DST-Verschiebungen bei Mitternachtsarithmetik, dadurch bleiben Ergebnisse stabil.