Calculate the exact difference between two dates instantly with our free date difference calculator. Perfect for project planning, countdown timers, age calculations, event planning, and tracking important milestones. This tool provides precise calculations in days, weeks, months, and years, helping you understand time spans for deadlines, anniversaries, vacation planning, or any situation where you need to know how much time has passed or remains. Simply select your start and end dates to get instant, accurate results across multiple time units.
How to Use the Date Difference Calculator
- Select your start date using the date picker
- Select your end date
- View the difference calculated automatically in days, weeks, months, and years
- Use these results for planning, tracking, or countdown purposes
Related Calculators
Frequently Asked Questions
How do you calculate the difference between two dates?
The calculator finds the absolute difference in milliseconds between the two dates, then converts this to days, weeks, months, and years. It accounts for varying month lengths and leap years for accurate results.
Why are months calculated as 30.44 days?
Months vary between 28-31 days, so we use the average month length (365.25 days / 12 months = 30.44 days) for month calculations. This provides the most accurate approximation across different date ranges.
Can I use this for countdown timers?
Yes! Set your start date to today and your end date to your target date (wedding, vacation, retirement, etc.) to see exactly how many days, weeks, months, or years remain until that special event.
Try another calculator
Back to Finance Calculators