Date Calculator
A date calculator helps you find the exact number of days between any two dates, or add and subtract days from a specific date. Enter your start date and end date, and the tool instantly shows the duration in years, months, weeks, and days. Every result updates live as you change the inputs.
People use this tool in many situations. Event planners use it to count down to weddings, conferences, and launch dates. HR teams use it to calculate notice periods and probation durations. Project managers use it to measure timelines and deadlines. Students use it to track exam dates and assignment due dates. Legal teams use it to count contract periods. Travelers use it to plan trips. Anyone who needs to know exactly how many days between two points in time can use this tool in seconds.
The tool offers three calculation modes. Days Between Dates measures the exact duration from one date to another. Add or Subtract Days lets you move forward or backward from any date. Business Days mode excludes Saturdays, Sundays, and any holidays you add so you only count working days. You can switch between modes at any time and the live preview updates instantly.
Every result includes a full breakdown. Years, months, weeks, and days. You also see the total days, total weeks, and total business days when that mode is enabled. The result comes with a copy button so you can save the details. The tool runs in your browser, needs no signup, and works on desktop and mobile.
Enter your dates and instantly see your date calculation.
Frequently Asked Questions About Date Calculator
Is this date calculator free to use?
Yes. The tool is completely free with no signup, no limits, and no hidden charges.
How does the date calculator work?
Choose a mode, enter your dates, and the tool calculates the result instantly. Days Between Dates measures duration. Add or Subtract Days moves a date forward or back. Business Days mode excludes weekends and holidays.
What is the difference between calendar days and business days?
Calendar days count every day including weekends. Business days exclude Saturdays, Sundays, and any holidays you add. Use business days for work related planning and calendar days for general duration.
Does the calculator include the end date?
By default the tool counts the days between dates without including the end date. You can enable the Include End Date toggle to count it.
Can I add or subtract days from a date?
Yes. Switch to Add or Subtract mode, enter your base date, enter the number of days, and choose add or subtract. The result appears live.
Can I calculate the number of weeks between two dates?
Yes. The tool shows total weeks and a full breakdown in years, months, and days.
Does the calculator save my dates?
No. Everything runs in your browser. Your dates are never uploaded to any server.
Can I use this tool on mobile?
Yes. The calculator works on all devices including phones, tablets, and desktop computers.