Calculate Date Difference
What is a Date Difference Calculator?
A date difference calculator is a free online tool that calculates the exact duration between two dates. This days between dates calculator helps you determine how many days, months, weeks, hours, and minutes exist from one date to another. Whether calculating time between dates for project planning, age calculations, or event countdowns, our date calculator provides instant, accurate results.
Our calculator also functions as a business days calculator, allowing you to exclude weekends and calculate only working days. This is essential for project management, delivery estimates, and professional scheduling where only weekdays count toward deadlines.
Common Uses for Date Calculator
Project Management
Calculate project timelines, deadlines, and working days between milestones.
Age Calculations
Determine exact age, anniversary dates, or days between important life events.
Event Planning
Count down to weddings, vacations, or special occasions with our days counter.
Legal & Contracts
Calculate contract periods, notice periods, and legal deadlines accurately.
Financial Planning
Calculate investment periods, loan terms, and payment schedules.
Pregnancy & Health
Track pregnancy weeks, medical treatment durations, and recovery periods.
How to Use the Date Difference Calculator
Enter Start Date
Select the beginning date (from date) using the calendar picker or type it manually.
Enter End Date
Choose the ending date (to date). Can be in the past or future.
View Results
Get instant results in multiple formats: years, months, weeks, days, hours, and business days.
Frequently Asked Questions About Date Calculator
How do I calculate the difference between two dates?
To calculate the difference between two dates, simply enter your start date and end date in the date calculator. The tool will automatically calculate the duration in years, months, weeks, days, hours, and minutes. The calculation accounts for leap years and varying month lengths for accurate results.
How many days are between two dates?
Use our days between dates calculator to find the exact number of days. Enter the start date and end date, and the calculator will show the total number of calendar days, business days, weeks, and other time units between the two dates.
What are business days and how are they calculated?
Business days (also called working days or weekdays) are Monday through Friday, excluding weekends. Our business days calculator automatically excludes Saturdays and Sundays from the count. Business days are commonly used for delivery estimates, project timelines, and work schedules.
Does the date calculator include the start and end date?
By default, our date difference calculator counts from the start date up to but not including the end date. You can toggle the 'Include End Day' option to add 1 day to the result if you want to include both the start and end dates in your calculation.
Can I calculate dates in the past or future?
Yes! Our date calculator works for any date combination - past to present, present to future, or between any two dates in history or the future. You can calculate how many days ago something happened or how many days until a future event.
How accurate is the date difference calculator?
Our date difference calculator is 100% accurate. It accounts for leap years (366 days), varying month lengths (28-31 days), and provides precise calculations down to the minute. The tool uses standard calendar calculation methods to ensure reliability.
Tips for Using Date Calculators
Business Planning
When planning projects, always use the business days calculator to exclude weekends and get realistic timelines for work completion.
Leap Year Awareness
Our calculator automatically handles leap years. February has 29 days in leap years (2024, 2028) instead of the usual 28 days.
Include End Day Option
If you need both start and end dates counted (e.g., hotel stays), enable the 'Include End Day' option to add 1 day to your result.
Multiple Time Units
View results in the format that best suits your needs - days for short periods, weeks for medium spans, or years for longer durations.