Write a java program to find the day of birth

Given an input as the date of birth of the person, write a program to calculate on which day (MONDAY, TUESDAY….) he was born to store and print the day in Upper Case letters.

The return type of the output is a string which should be the day on which the person was born.

NOTE: date format should be(dd-MM-yyyy)

Input and Output Format

• Input consists of a date string.
• The output is a string which the day on which the person was born.

Refer sample output for formatting specifications

Sample Input 1:

29-07-2013

Sample Output 1:

MONDAY

Sample Input 2:

14-12-1992

Sample Output 2:

MONDAY

Program to find the day of birth in Java

Following are the steps to find the day of birth in Java:

• Input a string from the user.
• Pass the string to calculateBornDay() method.
• Inside the method, first, create the object of SimpleDateFormat with a given pattern. Then, parse the string to produce a date.
• Now, create one more instance of SimpleDateFormat with a given pattern. By using this instance, format the date specified into a string.
• At last, return the string.

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Scanner;

public class Main {
  public static void main(String[] args) throws ParseException {

    Scanner sc = new Scanner(System.in);
    String s1 = sc.nextLine();
    System.out.println(calculateBornDay(s1));
  }

  public static String calculateBornDay(String s1) throws ParseException {
    SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
    SimpleDateFormat sdf1 = new SimpleDateFormat("EEEEE");
    Date d = sdf.parse(s1);
    String s = sdf1.format(d);
    return s.toUpperCase();
  }
}

Output

Program to Calculate Age from Date of Birth using Period class

Period Class: A date-based amount of time in the ISO-8601 calendar system. In Java 8, the Period class is used to store the difference between the two local date instances.

Refer sample output for formatting specifications

Sample Input :

[Input is provided in the program]

Sample Output :

Years: 27
Months: 11
Days: 11

Following are the steps to find the age using the Period class in Java:

• First, get the current date from the system clock using LocalDate. And, pass the year, month, and date.
• Now, use the Period class to find the difference between the two LocalDate instances.
• Print years, months and days using getYears(), getMonths() and getDays().

package com.demo2;

import java.time.LocalDate;
import java.time.Month;
import java.time.Period;

public class CalculateAge {
    public static void main(String[] args) {
        LocalDate now = LocalDate.now();
        LocalDate born = LocalDate.of(1994, Month.FEBRUARY,2);
        Period period = Period.between(born,now);
        System.out.println("Years: "+period.getYears());
        System.out.println("Months: "+period.getMonths());
        System.out.println("Days: "+period.getDays());
    }
}

Output

Thus, in this way, we learn how to calculate the day of birth in Java.