Counting number of days in a given month of a year

September 7, 2023

Number of days in a given month of a given year in Java

In this page we will discuss the program to find the number of days in a given month of a given year in java . Number of days in any month of a year can vary specifically in February as the cycle of leap year repeats in every 4 years when the year is leap February gives the count to 29 days but the when the year is not leap it gives count to 28 days and so no of days in a year varies from 365 to 366.

Method Discussed :

Method 1: Using if-else ladder.
Method 2 : Using Switch Case.
Method 3 : Using Array

Method 1 :

Check if the given month is February.
If True Check if the year is a year leap or not.
If year is a leap year Print 29 Days, Else Print 28 Days.
Now, check if month is 1, 3, 5, 7, 8, 10, 12, then print 31 days.
Check if month is 4, 6, 9, 11 then print 30 days.
Otherwise, print Invalid Month.

Method 1 : Code in Java

Run

import java.io.*;
import java.util.*;

class Main{

    public static void main(String args[]){

        int month, year;
        month = 12;
        year = 2012;
        if((month==2) && ((year%4==0) || ((year%100!=0)&&(year%400==0))))
            System.out.println("Number of days is 29");

        else if(month==2)
            System.out.println("Number of days is 28");

        else if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12)
            System.out.println("Number of days is 31");

        else
            System.out.println("Number of days is 30");


    }

}

Output

Number of days is 31

Method 2 :

In this method instead of using if-else-if ladder we use switch case.

Method 2 : Code in Java

Run

import java.io.*;
import java.util.*;

class Main{

    public static void main(String args[]){
        
        int month=12, year = 2012;
        switch (month) {
            // Cases for 31 Days
            case 1:
            case 3:
            case 5:
            case 7:
            case 8:
            case 10:
            case 12:
            System.out.println("Number of days is 31");
            break;
  
            // Cases for 30 Days
            case 4:
            case 6:
            case 9:
            case 11:
            System.out.println("Number of days is 30");
            break;
  
            // Case for 28/29 Days
            case 2:
                if((year%400==0) || ((year%100!=0)&&(year%4==0)))
                    System.out.println("Number of days is 29");
                else System.out.println("Number of days is 28");
            break;
  
            default:
            System.out.println("Invalid Month.");
            break;
        }
    
    }
}

Output

Number of days is 31

Lowest Common Multiple (LCM)

Greatest Common Divisor

Binary to Decimal to conversion

Octal to Decimal conversion

Hexadecimal to Decimal conversion

Method 3 :

In this method instead of using if-else-if ladder or switch case, we use array.

Method 3 : Code in Java

Run

import java.io.*;
import java.util.*;

class Main{

    public static void main(String args[]){
        
        int arr[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
        int month = 12, year=2012;
    
        //For checking leap year
        if(month==2 && ((year%400==0) || ((year%100!=0)&&(year%4==0))))
            System.out.println("Number of days is "+ arr[month-1]+1);
    
        else System.out.println("Number of days is "+arr[month-1]);
            
    }
}

Output

Number of days is 31

Implementation:

Start.
Take user inputs like month and year.
Check if the given month is February.
If True Check if the year is a year leap or not.
If year is a leap year Print 29 Days, Else Print 28 Days.
If Condition in Step 3 is False Check the month.
Print the number of days assigned to specific Month.
End.

Code in Java:

import java.io.*;

import java.util.*;

class PrepInsta

{

    public static void main(String args[])

    {

    int month, year;

    Scanner sc = new Scanner(System.in);

    System.out.println("enter the month and year: ");

    month=sc.nextInt();

    year=sc.nextInt();

    if(((month==2) && (year%4==0)) || ((year%100==0)&&(year%400==0)))

    {

        printf("Number of days is 29");

    }

    else if(month==2)

    {

        printf("Number of days is 28");

    }

    else if(month==1 || month==3 || month==5 || month==7 || month==8 || month==10 || month==12)

    {

        printf("Number of days is 31");

    }

    else

    {

        printf("Number of days is 30");

    }

}

}

Output:

enter the month and year

1

2021

Number of days is 31

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One comment on “Counting number of days in a given month of a year”

Ankitha
public class NoOfDaysinMonth {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
int y =sc.nextInt();
int m = sc.nextInt();
if((m=8 && m%2!=0)) {
System.out.println(“No of days are 30”);
}else if((m=8 && m%2==0)) {
System.out.println(“No of days are 31”);
}else if(((y%400==0)||(y%100!=0 && y%4==0)) && m==2) {

System.out.println(“No of days are 29”);
}else {
System.out.println(“No of days are 28”);
}
}
}

1

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