Date & Age Calculator
Days between dates, your exact age, and quick countdowns.
How to Use This Calculator
This calculator has three modes. Use Date difference to find how many days, weeks, or years lie between any two dates. Use Age to calculate your exact age in years, months, and days from your date of birth. Use Countdown to see how many days remain until a future event — or how many days have passed since a past one.
All calculations update instantly as you change the dates. Negative results in the countdown tab simply mean the target date is in the past.
Common Use Cases
- Project deadlines: Count the exact number of working or calendar days to a delivery date
- Age verification: Calculate exact age in years, months, and days for legal or medical purposes
- Event countdowns: Days until a wedding, holiday, exam, or product launch
- Contract durations: Find the precise length of a lease, subscription, or employment period
- Pregnancy milestones: Calculate gestational age or due date distances
- Historical research: Find the number of days between two historical events
Tips & Tricks
Leap years are handled automatically: The calculator accounts for leap years in all calculations, so you'll always get the precise day count rather than an approximation.
Working days: This calculator counts all calendar days. If you need working days only, subtract roughly 5/7 of the total days, then manually account for public holidays.
Age in days: Switch to the Date difference tab and set "From" to your date of birth and "To" to today to see your total age in days — a fun fact to know.