Add or subtract days, weeks, months, or years from a date. Useful for project planning, deadlines, and scheduling. Results update instantly.
Add or subtract years, months, weeks, or days from a specific date.
Explore more free tools for all your date, time, and calendar calculations
Calculate exact age in years, months, and days
Convert pet age to human years
Add, subtract, and calculate time durations
Calculate work hours and overtime
Browse our complete collection of all calculators
The most comprehensive free online date calculator for all your date calculation needs
Our free online date calculator finds days between two dates or adds and subtracts days, weeks, months, and years from any date—with an optional business-days mode. For work hours between times, use our Hours Calculator; for adding or subtracting time (hours, minutes, seconds), try our Time Calculator; for age in years and days, use our Age Calculator.
Accurately calculate days between any two dates
Add or subtract years, months, weeks, or days
Exclude weekends for working day calculations
Instant calculations as you change inputs
Works perfectly on all devices and screens
All calculations happen in your browser
Calculate days between project milestones
Days until weddings, vacations, or events
Calculate working days excluding weekends
Add months to calculate maturity dates
Days since or until birthdays
Calculate lease or rental durations
Our date calculator uses JavaScript's Date object for precise calculations, accounting for leap years, different month lengths, and timezone adjustments. It's highly accurate for all date calculations.
Yes! When adding or subtracting days, you can enable the 'Business Days' option to exclude weekends (Saturdays and Sundays) from the calculation.
Absolutely! You can calculate days between any dates, past or future, including historical dates from centuries ago.
100% safe. All calculations happen locally in your browser. We don't store, upload, or track any of your date inputs or results.
Yes, our date calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers.
You can calculate dates up to year 9999. For extremely large date ranges (over 1000 years), results are still accurate but may take a moment to compute.
Start using our free date calculator now. No registration required - just accurate, instant results.
Explore these related free tools to enhance your productivity and workflow.
Calculate exact age in years, months, and days
Calculate time differences and durations
Calculate work hours, overtime, and time tracking
Convert time between different time zones
Calculate last working day from notice period. Resignation calculator. Free.
Calculate years and months of work experience. Tenure calculator. Free.
Discover more helpful guides and tutorials to enhance your productivity and learn new skills.
Learn how to use date calculator to find days between dates, add or subtract time periods, and calculate business days.
Read more →Everything you need to know about date calculations. Learn how to add days, subtract weeks, calculate differences, and work with dates effectively.
Read more →Discover practical ways to use date calculator for effective project planning and time management.
Read more →Learn how to use our free hours calculator to calculate work hours, billable time, and time differences.
Read more →Use the 'Days Between Two Dates' section above: enter start date and end date, then click 'Calculate Days Between'. You get the exact number of days. Tick 'Include end day' if the end date should count. This date difference calculator works for any two dates.
Use the 'Add or Subtract From a Date' section. Pick your start date, choose Add or Subtract, then enter years, months, weeks, and/or days. The online date calculator shows the resulting date instantly. Enable 'Business Days Only' to exclude weekends.
Business days are weekdays (Monday through Friday), excluding weekends and holidays. When you enable the 'Business Days Only' option, the calculator will count only weekdays, which is useful for project planning and deadline calculations.
Yes! Our date calculator is 100% free with no registration required, no usage limits, and no hidden fees. You can use it as many times as you need.
Absolutely! The date calculator is fully responsive and works perfectly on smartphones, tablets, and desktop computers. The interface adapts to your screen size for optimal usability.
No, all calculations happen locally in your browser. We don't store your dates, calculation history, or any personal data. Your privacy is completely protected.