Date Math Calculators
Date arithmetic tools compare and shift calendar dates. Find the difference between two dates in years, months and days, count the weeks between them, or add and subtract days, weeks, months and years from a date to see the result and its weekday.
Last updated October 19, 2026
All Date Math tools
Date & Time · Date Math
Date Difference CalculatorThe difference between two dates in years, months, weeks and days
Date & Time · Date Math
Weeks Between DatesWeeks and leftover days between two dates
Date & Time · Date Math
Date CalculatorAdd or subtract days, weeks, months or years from a date
Date & Time · Date Math
Days Between DatesHow many days between two dates, with an include-end-date option and business days
Date & Time · Date Math
Business Days CalculatorCount business days between two dates or add and subtract them, skipping weekends and your holidays
Date & Time · Date Math
Date To Date CalculatorThe span between two dates in days, weeks, months and years, with an include-last-day option
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Time Card CalculatorAdd up the hours on a weekly time card, with breaks and optional pay
Date & Time · Work Hours & Time
Time Clock CalculatorHours worked between clock in and clock out
Date & Time · Work Hours & Time
Work Hours CalculatorWorking days and work hours between two dates