Date Calculator
Calculate your exact age, the difference between dates, or add/subtract days
Enter your birthdate to see your exact age in years, months, and days — plus how many days you’ve been alive and when your next birthday falls.
The Date Difference tab calculates the gap between any two dates, shown as years/months/days as well as total days, weeks, and approximate months — useful for project timelines, contract durations, or anniversaries.
Use Add / Subtract Days to find the date that falls a certain number of days before or after any starting date — handy for deadlines, countdowns, or scheduling.
How to Use
- 1Choose a tab — Age Calculator, Date Difference, or Add/Subtract Days.
- 2Enter your dates using the date pickers — results calculate instantly.
- 3Use the Age Calculator to find your exact age down to the day, or the Date Difference tab to find how many days between any two dates.
Frequently Asked Questions
- How exact is the age calculation?
- Exact to the day — we account for leap years and calculate the precise number of years, months, and days between your birthdate and today.
- Can I calculate dates in the future?
- Yes — all three tabs work with past and future dates equally.
- What is the Add/Subtract Days tab useful for?
- Finding deadlines, due dates, expiration dates, or any situation where you need to know what date falls X days from a starting point — like ‘90 days from today’ or ‘45 days before an event’.
- Does it handle leap years correctly?
- Yes — leap years are fully accounted for in all calculations.