Date math

Add or subtract days, weeks, months, or years, and count the span between two dates.

14 free date math tools, no signup.

• Add Days to Date CalculatorAdd a number of days to any date and get the resulting date and weekday, with month lengths and leap years handled.
• Add Months to Date CalculatorAdd a number of months to any date and get the resulting date and weekday, with short months handled.
• Add Weeks to Date CalculatorAdd a number of weeks to any date and get the resulting date and weekday.
• Add Years to Date CalculatorAdd a number of years to any date and get the resulting date and weekday, with leap-day handling.
• Business Days CalculatorCount business days between two dates, skipping weekends and holidays you list. Get workdays, weekend days, and the total span.
• Date Calculator (Add or Subtract)Add or subtract years, months, weeks, and days from a date to find a new date and its day of the week.
• Date Difference CalculatorFind the difference between two dates in years, months, days, weeks, and total days. Order does not matter and it runs in your browser.
• Days Between DatesCount the number of days between two dates, including business days and weekend days, with an option to include the end date.
• Days Since Date CalculatorCount the days since a past date, with the elapsed time also shown in years, months, and days.
• Days Until Date CalculatorCount the days until a future date, with the gap also shown in years, months, and days. Free and browser-based.
• Months Between DatesCount the whole calendar months between two dates, plus any leftover days.
• Subtract Days from Date CalculatorSubtract a number of days from any date and get the resulting date and weekday, with month lengths and leap years handled.
• Weeks Between DatesCount the number of weeks and leftover days between two dates, plus the total day count.
• Years Between DatesFind the exact years, months, and days between two dates, with correct leap-year handling.