Date Difference Calculator
Find the number of years, months and days between two dates.
Your file never leaves this browser tab — everything runs locally on your device.
How to use date difference calculator
- Pick a start date and an end date.
- Read the difference broken down into years, months and days, plus the total number of days.
Common use cases
- Working out someone's exact age or how long ago an event happened.
- Calculating the length of a project, contract or lease period.
- Finding the number of days until or since a deadline.
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