Date Difference Calculator
Calculate the exact difference between two dates in multiple units: days, weeks, months, and years. Perfect for age calculations, project timelines, and historical date comparisons.
Date Difference Breakdown
| From | To | Difference |
|---|---|---|
| Jan 1, 2020 | Jan 1, 2024 | 4 years / 1461 days |
| Mar 15, 2023 | Dec 25, 2023 | 9 months, 10 days |
| Your birthday | Today | Your exact age |
Precise Age Calculation
``javascript
function calculateAge(birthDate, targetDate = new Date()) {
const birth = new Date(birthDate);
const target = new Date(targetDate);
let years = target.getFullYear() - birth.getFullYear();
let months = target.getMonth() - birth.getMonth();
let days = target.getDate() - birth.getDate();
if (days < 0) {
months--;
days += new Date(target.getFullYear(), target.getMonth(), 0).getDate();
}
if (months < 0) {
years--;
months += 12;
}
return { years, months, days };
}
``
Our calculator handles all edge cases including leap years, varying month lengths, and negative differences (future dates).