Date Calculator
Calculate days between dates, add or subtract days, and perform various date calculations with our free online tool
Date Calculator
Ready to Calculate
Enter your dates and calculation parameters to get started
How to Use This Calculator
Choose Calculation Type
Select whether you want to calculate the difference between two dates or add/subtract days from a date.
Enter Dates
For date difference: Enter start and end dates. For add/subtract: Enter a date and the number of days to add or subtract.
Select Operation
Choose whether to add or subtract days when using the add/subtract calculation type.
Calculate
Click the calculate button to get your results, including total days, weeks, months, and years.
Date Calculation Tips
Use the date difference calculator to find out how many days until an important event
Business days exclude weekends and can help with project planning
The calculator automatically handles leap years in date calculations
You can calculate dates in the past or future by adding negative numbers
Week calculations are approximate and based on 7-day weeks
Month and year calculations provide estimates and may vary slightly