Date Calculator Your smart Date Calculator
Simple date calculations for every use case. Fast, accurate, and completely free.
- ✓ Calculate days, weeks, months & years
- ✓ Consider working & business days
- ✓ Find duration between two dates
- ✓ Easy to use – no registration required
Calculate Date
Select a calculation type and enter your values.
Key Facts at a Glance
The Date Calculator is a free online tool for precise calendar calculations. Easily calculate target dates by adding or subtracting days, weeks, months, and years. The calculator dynamically accounts for the Gregorian calendar, leap years, and German public holidays at the state level. It is ideal as a notice period calculator for contracts, a business day calculator for projects, and a time span tool for personal planning.
Unsere Rechner-Tools
14 spezialisierte Datumsrechner für jede Situation – von Arbeitstagen bis Kündigungsfristen. Jeder Rechner bietet maßgeschneiderte Funktionen und Erklärungen.
Datumsrechner
Zentraler Rechner – alle Funktionen in einem Tool
Zeitspannen berechnen
Zwischen zwei Daten
Berechnen Sie die exakte Zeitspanne zwischen zwei Daten in Tagen, Wochen, Monaten und Jahren.
Datumsdifferenz Rechner
Detaillierte Aufschlüsselung der Differenz in Jahren, Monaten, Wochen und Tagen gleichzeitig.
Tage Rechner
Tage zwischen zwei Daten zählen oder Tage addieren/subtrahieren. Der universelle Tagesrechner.
Tage & Wochen berechnen
Datum + Tage
Addieren Sie Tage zu einem Datum und erhalten Sie das Zieldatum.
Datum − Tage
Subtrahieren Sie Tage und berechnen Sie vergangene Daten rückwärts.
Wochen Rechner
Wochen zwischen zwei Daten oder Wochen addieren/subtrahieren. Mit KW nach ISO 8601.
Arbeitstage Rechner
Arbeitstage (Mo–Fr) zwischen zwei Daten mit Feiertagen nach Bundesland.
Monate & Jahre berechnen
Monate Rechner
Monate addieren/subtrahieren mit Monatsende-Überlauf-Korrektur (31. → 28. Feb).
Jahre Rechner
Jahre addieren/subtrahieren mit Schaltjahr-Behandlung. Auch als Altersrechner nutzbar.
Werktage Rechner
Werktage (Mo–Sa, 6-Tage-Woche) berechnen. BUrlG-konform für Urlaubsberechnung.
Praxis & Recht
Fristenrechner
Rechtliche Fristen nach BGB §§ 187–193 mit Fristverschiebung bei Wochenende/Feiertag.
Kündigungsfrist
Kündigungsfristen nach § 622 BGB. Gestaffelt nach Betriebszugehörigkeit.
Lieferdatum Rechner
Voraussichtliches Lieferdatum aus Versanddatum + Lieferzeit in Werktagen.
Urlaubsrechner
Urlaubsanspruch in Arbeitstagen berechnen mit Brückentagen nach Bundesland.
Alle Rechner sind kostenlos, ohne Registrierung und DSGVO-konform.
Jetzt berechnenHow the Date Calculator Works
The Date Calculator computes a target date in 3 simple steps. Select a start date, enter the desired number of days, weeks, months, or years, and get your result instantly.
Select Start Date
Enter the starting date. Today's date is preselected. The calculator accepts all dates in the Gregorian calendar.
Enter Time Period
Select plus or minus, and enter the number of years, months, weeks, or days.
Get the Result
The Date Calculator shows the computed target date, weekday, calendar week, and workday statistics instantly.
Two Calculation Methods for Precise Results
The Date Calculator offers 2 methods: Add/Subtract Date and Calculate Date Difference. Toggle between them below.
Add or Subtract Date
Enter a start date and choose plus or minus. The calculator adds or subtracts the specified number of days, weeks, months, or years and displays the target date with the weekday and calendar week. Leap years and different month lengths (28, 29, 30, 31 days) are automatically handled.
- ✓ Combine days, weeks, months, and years
- ✓ Fully automatic leap year calculation
- ✓ Based on the Gregorian calendar
Calculate Date Difference
Enter 2 dates (start date and end date) and the calculator computes the difference in days, weeks, months, and years. The workday calculator displays the number of workdays, weekend days, and public holidays separately.
- ✓ Date difference in days, weeks, and months
- ✓ Workdays and weekends separated
- ✓ German holidays by state
A Practical Example
Calculation: "Which date lies 90 days after January 15, 2025?"
Other Applications of the Date Calculator
Project Planning & Deadlines
Calculate milestones and end dates for projects. The workday calculator counts business days and excludes weekends and holidays.
Calculate Contract Terms
Determine notice periods, contract renewals, and durations. Calculate precise end dates accounting for public holidays.
Vacation Planning
Plan your annual leave efficiently. Find bridge days and optimize your time off around national holidays.
Payment Terms & Invoices
Determine the due date for invoices with terms like "30 days net" or "90 days". The calculator finds the exact date.
Age Calculator & Birthdays
Calculate exact age in years, months, and days. Simply enter the birth date as the start date.
Development & Integration
Use date calculations as a reference for Excel, Google Sheets, Python datetime, or the JavaScript Date API.
📚 Sources & References
- Gregorian Calendar: International standard for calendar date calculations since 1582
- ISO 8601: International standard for date and time formats (calendar week, week numbers)
- Holiday Laws: State regulations and public holiday calculations
🔄 Last Updated
Recent updates to the Date Calculator
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Still have questions? We are here to help.
Do you have questions about the date calculator or suggestions for improvement? Contact us.
Get in TouchFrequently Asked Questions (FAQ)
Find quick answers to the most important questions about date calculations and deadlines.
Workdays are calculated by excluding Saturdays and Sundays. If 'Exclude public holidays' is enabled, the tool also detects all official public holidays for the selected German state during that period and subtracts them.
The tool considers all statutory public holidays in Germany. Depending on the selected state, this includes regional holidays such as Corpus Christi, All Saints' Day, Reformation Day, or Epiphany. National holidays like New Year's Day, Good Friday, Easter Monday, Ascension, Whit Monday, Labour Day, Day of German Unity, and Christmas are always included.
Yes, our date calculator automatically accounts for leap years (years with 366 days and a February 29th) for all past, present, and future calculations. You don't need to make any manual adjustments.
According to § 187 BGB, a deadline usually begins on the day after the event. If a deadline ends on a Saturday, Sunday, or public holiday, the deadline is extended to the next working day (§ 193 BGB). Our tool helps you compute these rules accurately.