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, 2020Jan 1, 20244 years / 1461 days Mar 15, 2023Dec 25, 20239 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).