Date & Age Calculator
Calculate exact age, duration between two dates, business working days, and date offsets client-side.
🔒 Runs in your browser · No upload · No signup
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Frequently Asked Questions
How does the business day calculation work? ↓
The business days calculation excludes Saturdays and Sundays between your selected start and end dates. Standard calendar days include all 7 days of the week.
Is my birthday or personal date data private? ↓
Yes, 100%. All calendar calculations are performed in your browser. No birthdates or timeline queries are ever transmitted to any server.
How does leap year calculation work? ↓
The calculator adheres to standard Gregorian calendar rules, accurately factoring in leap years (such as February 29th) across all years and centuries.
Can I add or subtract days from a date? ↓
Yes. Switch to the "Add / Subtract Days" tab to compute future or past calendar dates by adding or subtracting custom days, weeks, months, or years.