Date Difference Calculator
Compare dates without timezone or daylight-saving shifts affecting date-only results.
Loading calculator…
Browser-only processingCalculations are performed locally in your browser. Your entered values are not sent to our servers.
Date Difference Calculator formula
Total days use calendar day numbers; years, months and days use calendar-aware borrowing.
Worked example
January 1 to January 8 is 7 days, or 8 days when the end date is included.
How to use this calculator
- Choose start and end dates.
- Choose whether to include the end date.
- Calculate or swap the dates.
Important assumptions and limitations
Reverse ranges are reported clearly and measured by absolute duration.
Related calculators
Percentage CalculatorCalculate percentages, percent change, increases and decreases.Discount CalculatorFind sale price, sequential discounts, tax and total savings.Age CalculatorCalculate exact calendar age, total days and the next birthday.Profit Margin CalculatorCompare profit margin and markup or calculate a target selling price.
Frequently asked questions
What does include end date do?
It adds one calendar day to the inclusive range.
Can the end date be earlier?
Yes. The calculator identifies the direction and still reports the duration.