Age & Date Difference Calculator
Calculate exact age from date of birth, find the difference between two dates, or add/subtract days from a date. Free online date calculator.
Exact Difference
What is the Age & Date Difference Calculator?
Calculate exact age or find the difference between two dates in years, months, weeks, and days. Add or subtract time from a date. Built for optimal performance, this tool executes client-side directly in your browser without uploading your sensitive data to external servers.
How to use the Age & Date Difference Calculator
- Choose your calculation mode: 'Age Calculator', 'Date Difference', or 'Add/Subtract Days'.
- Pick your primary starting date (e.g., date of birth or project kick-off) and target comparison date.
- Click calculate to receive a comprehensive breakdown in years, months, weeks, days, hours, and minutes.
- View next milestone counters, such as days remaining until the next birthday or contractual deadline.
Example: Calculating Exact Age on October 14, 2026
Birthdate: June 15, 1995 | Comparison Date: October 14, 2026
31 Years, 3 Months, 29 Days (or 11,444 total days lived)
Accounts for leap years, variable calendar month lengths, and time transitions.
Technical Guide & Privacy Assurance
Use the 'Date Difference' tab to calculate working days for billing cycles and sprint deliverables by factoring out weekends.
Frequently Asked Questions
How is the exact age calculated?+
The tool calculates full years, months, and days between the Start Date (DOB) and End Date, accounting for leap years and varying month lengths.
Can I find out what date it will be in 90 days?+
Yes. Switch to the 'Add / Subtract Days' tab, set your Base Date, choose 'Add (+)', and type 90 in the Days box.
Are leap years included in the calculation?+
Yes, the JavaScript native Date object automatically accounts for leap years when computing the difference.