Date Calculator
Find the exact number of days between two dates, or add/subtract time from any date.
Free Date Calculator
Need to know how many days are left until a deadline, or what date it'll be 90 days from now? Our free Date Calculator handles both — find the exact gap between two dates, or add/subtract days, weeks, months, or years from any starting date.
How to Use This Tool
Days Between Two Dates: Enter a start and end date, then click Calculate to see total days, weeks, and business days.
Add or Subtract from a Date: Choose a starting date, an amount and unit (days, weeks, months, years), select Add or Subtract, then click Calculate.
How the Calculation Works
Date differences are calculated using exact calendar arithmetic, correctly accounting for leap years and the varying number of days in each month. Business days exclude Saturdays and Sundays.
Common Use Cases
- Counting down to a deadline, event, or anniversary.
- Estimating a delivery or project completion date.
- Calculating a contract or lease end date.
- Working out how many business days remain in a project.
Privacy & Security
All calculations happen locally in your browser. Your dates are never uploaded to a server.
Frequently Asked Questions
Related Tools
Also try our Age Calculator, Age Difference Calculator, and Time Calculator.
Ready to calculate? Choose a tab above and enter your dates — free and instant.
Share Your Experience
Found this tool useful? Have a suggestion or found a bug? Send your feedback directly to us — we read every message.