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  3. Date & Age Calculator
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What is Date & Age Calculator?

How many days between two dates? How old is someone born on a specific date? This calculator answers both. Enter dates to find the difference in years, months, days, weeks, or business days. It also calculates a person's exact age down to the day.

Getting Started

  1. 1Enter a start date and an end date, or enter a birth date
  2. 2View the difference broken down by years, months, days, weeks, and business days
  3. 3Toggle between date-difference mode and age-calculator mode

What You Get

  • Date difference in years, months, days, weeks, and business days
  • Exact age calculation from birth date
  • Leap year awareness
  • Business day counting (excludes weekends)
  • Support for past and future dates

Perfect For

  • Project planning

    Count business days between milestones to build realistic timelines.

  • Age verification

    Calculate someone's exact age for eligibility checks, forms, or celebrations.

  • Contract durations

    Determine the precise number of days or months in a contract period.

Frequently Asked Questions

Does it account for leap years?

Yes. February 29 is handled correctly for all leap years.

What counts as a business day?

Monday through Friday. Public holidays are not excluded — only weekends.

Can I calculate a future date by adding days?

Enter today's date and use the tool to add a specific number of days to find the target date.

Privacy First

All processing happens directly in your browser. Your files never leave your device and are never uploaded to any server.