Date Calculator

Calculate differences between dates, add or subtract days, months, and years. Professional date calculations with detailed breakdowns and business day analysis.

Date Selection

Start Date

End Date

Quick Actions

Select Two Dates

Choose a start date and end date to calculate the difference between them.

How to Use the Date Calculator

Choose Mode

Select between "Date Difference" to find time between two dates, or "Date Add/Subtract" to calculate future/past dates.

Enter Dates

Use the interactive calendar to select your dates. For calculations, choose operation type and time units (days, weeks, months, years).

View Results

Get instant detailed results including exact differences, business day analysis, and comprehensive time breakdowns.

Date Calculator Features

Advanced Date Calculations

• Precise date difference in years, months, days
• Add or subtract time from any date
• Business day analysis (workdays vs weekends)
• Multiple time unit support (days, weeks, months, years)
• Total time calculations (hours, minutes, seconds)
• Leap year accurate computations

Professional Tools

• Interactive calendar date picker
• Quick action buttons for common calculations
• Real-time calculation updates
• Comprehensive result breakdowns
• Quarter and day-of-week information
• Time zone independent calculations

Perfect for Various Date Calculations

Project Management

Calculate project durations, deadlines, and milestone dates for efficient planning.

• Project timeline calculations
• Deadline planning and tracking
• Business day analysis for work schedules
• Sprint and iteration planning

Personal Events

Plan anniversaries, birthdays, and special occasions with precise date calculations.

• Anniversary and milestone tracking
• Event planning and scheduling
• Relationship duration calculations
• Holiday and vacation planning

Business & Finance

Handle financial calculations, contract periods, and business date requirements.

• Contract and lease term calculations
• Financial period analysis
• Payment schedule planning
• Interest calculation periods

Frequently Asked Questions

How accurate are the date calculations?

Our date calculator is 100% accurate and accounts for leap years, different month lengths, and all calendar irregularities to provide precise results down to the exact day.

Can I calculate business days only?

Yes! Our calculator provides detailed business day analysis, showing the breakdown between workdays (Monday-Friday) and weekends, with percentages for easy understanding.

What date range does the calculator support?

The calculator supports dates from 1900 to 2100, making it suitable for historical research, current planning, and future projections across centuries.

How do I add months to a date accurately?

When adding months, our calculator intelligently handles varying month lengths. For example, adding 1 month to January 31st results in February 28th (or 29th in leap years).

Is there a mobile-friendly version?

Yes! Our date calculator is fully responsive and optimized for mobile devices, tablets, and desktops, providing the same functionality across all platforms.

Date Calculation Tips & Tricks

Quick Calculation Methods

Use the "Today" button to quickly set current date as reference point
Switch between modes easily with the toggle buttons at the top
Use quick action buttons for common time periods (week, month ago)
Swap dates instantly with the arrow button in difference mode

Understanding Results

Total days gives the exact count, while years/months/days show precise breakdown
Business day analysis helps with work-related planning and scheduling
Quarter information is useful for financial and business planning
Day of week results help plan events and meetings effectively