Date Difference Calculator
Free online date difference calculator. Find exact days, weeks, months and years between two dates. Perfect for age gaps, deadlines and project timelines.
Select two dates to see the exact calendar difference.
Calculating Date Differences
This calculator finds the exact calendar difference between two dates in years, months, weeks, and days. It accounts for leap years and varying month lengths for reliable results.
Common Uses
Calculate age, days until an event, project duration, contract lengths, relationship anniversaries, or how long ago something happened. Perfect for planning and tracking important dates.
Leap Years Matter
Leap years occur every 4 years (with exceptions for century years). February has 29 days instead of 28. This calculator handles leap year calculations automatically.
Accuracy
The calculation is based on calendar dates rather than clock time. That makes it dependable for ages, deadlines, anniversaries, and date ranges where whole calendar days matter.
FAQs
How accurate is this calculator?
It is accurate for calendar-date calculations. It accounts for leap years and different month lengths, which is exactly what you need for age gaps, project dates, and anniversaries.
Can I calculate backwards in time?
Yes. If the end date is before the start date, the calculator keeps the same exact breakdown and clearly tells you that the final date comes before the initial one.