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Calculate Age using current date and date of birth
Posted on: October 23, 2009 at 12:00 AM

In this section you will learn how to calculate the age using Java.

Calculate Age using current date and date of birth

In this section you will learn how to calculate the age. For this purpose, through the code, we have prompted the user to enter current date and date of birth in a specified format. Now to determine the age, we have used the following code:

if(cal2.get(Calendar.DAY_OF_YEAR) <cal1.get(Calendar.DAY_OF_YEAR)) {
factor = -1;
}
age = cal2.get(Calendar.YEAR) - cal1.get(Calendar.YEAR) + factor;

Here is the code of CalculateAge.java:

import java.text.*;
import java.util.*;

public class CalculateAge{
public static void main(String[]args){
  System.out.println("Enter your Date of Birth in format MM-dd-yyyy");
  Scanner input=new Scanner(System.in);
  String dateOfBirth=input.nextLine() ;
  System.out.println("Enter Current date in format MM-dd-yyyy");
  String currentDate=input.nextLine() ;
try {
      Calendar cal1 = new GregorianCalendar();
      Calendar cal2 = new GregorianCalendar();
      int age = 0;
      int factor = 0;
      Date date1 = new SimpleDateFormat("MM-dd-yyyy").parse(dateOfBirth);
      Date date2 = new SimpleDateFormat("MM-dd-yyyy").parse(currentDate);
      cal1.setTime(date1);
      cal2.setTime(date2);
      if(cal2.get(Calendar.DAY_OF_YEAR) < cal1.get(Calendar.DAY_OF_YEAR)) {
            factor = -1;
      }
      age = cal2.get(Calendar.YEAR) - cal1.get(Calendar.YEAR) + factor;
      System.out.println("Your age is: "+age);
} catch (ParseException e) {
      System.out.println(e);
}
}
}

Output :

Enter your Date of Birth in format MM-dd-yyyy
8-28-1989
Enter Current date in format MM-dd-yyyy
9-23-2009
Your age is: 20

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