Date and Time Calculator

A date calculator is a versatile online tool for calculating time spans, date differences, and for adding or subtracting days from a specific date. Unlike a simple calendar, a date calculator offers precise calculations considering leap years, different month lengths, and working days. The tool is indispensable for project planning, contract management, vacation planning, and many other applications.

Our free date calculator enables three main functions: calculating the time span between two dates, adding days to a start date, and subtracting days from a date. The tool not only shows the result in days but also broken down into years, months, weeks, and even working days. All calculations are performed in real-time and completely locally in your browser.

In business, precise date calculation is essential. Contracts often have deadlines like "90 days after contract conclusion" or "30 working days before termination date". With our date calculator, you can determine such dates exactly without miscounting. Project managers use the tool to plan milestones and calculate deadlines, while HR departments determine notice periods and probation periods.

In private life, a date calculator is also extremely practical: Plan your vacation and calculate how many days you will be off. Determine important dates like "100 days before the wedding" for timely preparations. For legal deadlines – such as for objections or appeals – a calculation error can be expensive. Our tool guarantees error-free calculations.

The working days function is particularly valuable: Many deadlines are given in workdays, with weekends not counting. Our date calculator automatically considers Saturdays and Sundays and shows you the correct number of working days between two dates. Perfect for delivery dates, processing times, and contractual agreements.

The date calculator offers three main modes: In time span mode, you calculate the exact difference between two dates – ideal for age calculations, project durations, or historical comparisons. Addition mode adds a specific number of days to a start date – perfect for due dates, expiration dates, and planning. Subtraction mode subtracts days and is suitable for backward planning and countdown calculations.

Each result is comprehensively displayed: You see the total number of days, a breakdown into years, months and days, the number of weeks, and working days (Monday to Friday). This multidimensionality is important because different contexts require different counting methods. The calculation is extremely precise and considers all peculiarities of the Gregorian calendar.

The tool is extremely user-friendly: Simply choose the desired operation, enter dates, and immediately receive the result. You can calculate historical dates as well as future dates. Date selection is done via an intuitive calendar picker, which prevents input errors and speeds up operation.

Project Management: Calculate project periods and milestone dates. If a project starts on March 15 and is supposed to last 120 days, the calculator shows you the exact end date. Determine how many working days are available for a task. Plan buffer days by calculating different scenarios.

Contract Management: Calculate notice periods precisely, such as "3 months to quarter end". Calculate limitation periods, warranty periods, and extension options. For fixed-term contracts, you can determine the exact end date. For SLAs (Service Level Agreements) with response times in working days, the working days function is indispensable.

Travel Planning: Determine the duration of your trip in days and weeks. Calculate on which date you will return if you travel for 14 days starting June 1. Plan arrival and departure days and calculate stay durations for visa requirements.

Event Planning: Countdown calculations for weddings, birthdays, or company anniversaries. Determine important preparation dates: "6 months before the event", "100 days before the celebration". Coordinate delivery dates, booking deadlines, and invitation dispatch with precise date calculations.