Date Difference Calculator

Calculate the exact time between two dates in years, months, weeks, days, and more.

Use Cases

Discover practical ways to use the Date Difference Calculator:

  • Calculate Exact Age

    Enter your birth date and today's date to see your precise age in years, months, and days - perfect for birthday planning, medical records, or legal documents.

  • Project Timeline Tracking

    Calculate project duration and days remaining until deadline. Use the business days option to exclude weekends and get accurate working days for resource planning.

  • Event Countdown

    Count down days until a wedding, vacation, or special event. See the time remaining in various units to help plan preparation activities.

  • Legal/Contract Period Calculation

    Calculate notice periods, contract duration, or statutory deadlines. Use business days only option to ensure compliance with legal timelines and contractual obligations.

  • Historical Duration Analysis

    Find out how much time has elapsed since a past event. View historical timespans in relatable units for research, education, or personal milestones.

Frequently Asked Questions

How accurate is this date calculator?
Our calculator is precise to the exact day, correctly handling varying month lengths and leap years. It calculates the exact duration in years, months, days, and other units with complete accuracy.
Does it handle leap years correctly?
Yes! The calculator properly accounts for leap years in all calculations. Whether you're calculating across multiple leap years or dealing with February 29th, results are always accurate.
What does "Exclude weekends" do?
When enabled, the business days count excludes Saturdays and Sundays from the total. This is useful for calculating working days for project planning, legal deadlines, or contract periods.
Can I calculate dates in the past?
Absolutely! Enter any two dates from 1900 to 2100 to calculate the difference. You can calculate how long ago an event occurred or plan for future dates.
Are my dates saved or sent anywhere?
No. All calculations happen entirely in your browser. We never store or transmit your dates. Your data stays private on your device.