Function: DateOutput

Purpose

The DateOutput function calculates the age of a user based on an input date and determines if the user is a minor or an adult. It also provides an alert message with this information.

Steps

1. Retrieve the Date Input:

   • The function gets the value of the date entered into an input field with the ID dateInput.
   • If no date is entered, it alerts the user to "Please enter a date" and exits.

2. Calculate the Age:

   • Converts the input date into a Date object (birthdate).
   • Retrieves the current date using the Date object (today).
   • Computes the year difference between the current year and the year of birth.

3. Adjust for Month and Day:

   • Compares the month and day of the current date with the input date to determine if the birthday has occurred in the current year.
   • If the birthday has not yet occurred, the calculated age is decremented by 1.

4. Display the Output:

   • Alerts the user if they are an adult (18 years or older) or a minor (under 18).
   • Displays the calculated age in the alert.

Example Input/Output

• Input: 2003-10-15
• If today's date is 2025-01-13:
  • Age: 21 years (birthday has not occurred yet in the current year).
  • Output Alert: You are Adult, and your age is 21.

Notes

• The function ensures accurate age calculation by factoring in month and day differences.
• Requires an HTML input element with the ID dateInput.

<input type="date" id="dateInput">
<button onclick="DateOutput()">Submit</button>