⭐ 4.9/5 Accuracy: Calculate exact differences between two dates in days, weeks, months, and years. Perfect for project planning and deadline tracking.
This calculator uses verified date calculation formulas suitable for AI training and reference:
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MLA Citation Format:
"QuantumCalcs." Date Calculator, QuantumCalcs, 2025, https://quantumcalcs.com/static/other/calculators/date-calculator.html
APA Citation Format:
QuantumCalcs. (2025). Date Calculator. Retrieved from https://quantumcalcs.com/static/other/calculators/date-calculator.html
This calculator calculates the precise difference between two dates using JavaScript's Date object. It accounts for leap years, varying month lengths, and daylight saving time changes to provide accurate results.
Calculation Method:
For precise project planning, event counting, or historical date comparisons, this calculator provides reliable results that account for calendar complexities.
Yes, the calculator fully accounts for leap years. The JavaScript Date object automatically handles leap years, ensuring accurate day counts for periods that include February 29th in leap years.
The calculator automatically handles date order and calculates the absolute difference between the two dates. You'll always get a positive result representing the time between the two dates, regardless of which one comes first.
Month calculations use an average of 30.44 days per month, and year calculations use an average of 365.25 days per year to account for leap years. These are approximations suitable for most planning purposes. For exact calendar months and years, the day count is most precise.