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Age & Date Calculator

Calculate exact age in years, months, and days, or count total calendar days, weeks, and Monday-to-Friday business days between any two dates.

Free to useNo sign-up requiredWorks in your browserPrivacy focused

Age & Date Calculator Workspace

How to use

  1. 1

    Step 1

    Pick your Start Date (or Date of Birth) and End Date using the date pickers or quick Today and +30 Days buttons.

  2. 2

    Step 2

    View the exact calendar breakdown in years, months, and days alongside Total Days, Weeks + Days, and Next Anniversary countdown.

  3. 3

    Step 3

    Check the Business vs. Weekend Days section to see how many Monday–Friday working days fall within your date range.

Key features

  • Calculates exact calendar years, months, and days across leap years and varying month lengths
  • Counts Monday-to-Friday business days and Saturday/Sunday weekend days across your selected date range
  • Shows total weeks plus remaining days, total hours, and a countdown to the next birthday or anniversary
  • Quick Swap Dates and Today buttons make checking past or future project timelines effortless

Supported formats

DateTXT

File limits & notes

Business day counts include all Monday-through-Friday weekdays between your start and end dates. Public holidays vary by country and region and are not subtracted automatically.

Frequently asked questions

View all FAQs
How does the calculator handle leap years like February 29?

The calculator uses true calendar month lengths—including 29-day Februaries in leap years—so both exact age and total day counts remain accurate across any year.

What happens if my Start Date is later than my End Date?

If you enter a start date that comes after the end date, the tool still calculates the exact span between the two dates and notes that the dates were reversed.

Does the Business Days count include the start and end dates?

When counting the span between two dates, the calculator measures the exact number of days elapsed from the start date to the end date, broken into weekdays and weekend days.

Practical Example: Counting Working Days for a Project Delivery Window

Sample Input
A project kicking off on March 1 and scheduled for delivery on June 15 of the same year.
Result
Shows 3 months and 14 days (106 total calendar days), broken down into 76 Monday–Friday working days and 30 weekend days.