How to Use Date Difference Calculator
1
Set start and end dates.
2
Click Calculate.
3
View the difference in all units.
Features
✓Days, weeks, months, years, hours
✓Total days calculation
✓Quick "Set to today" button
Why Use This Tool
Calculate project durations
Find days until events
HR and legal date calculations
Frequently Asked Questions
Does it count both start and end dates?
It counts the days between — to include both dates add 1 to the result.
Can it handle leap years?
Yes, PHP DateTime handles leap years automatically.