Find the date after next half year from a given date

Given a positive integer D and a string M representing the day and the month of a leap year, the task is to find the date after the next half year.

Examples:

Input: D = 15, M = "January"
Output: 16 July
Explanation: The date from the 15th of January to the next half year is 16th of July.

Input: D = 10, M = "October"
Output: 10 April

Approach: Since a leap year contains 366 days, the given problem can be solved by finding the data after incrementing the current date by 183 days. Follow the steps to solve the problem:

Store the number of days for each month in that array, say days[].
Initialize a variable, say curMonth as M, to store the index of the current month.
Initialize a variable, say curDate as D, to store the current date.
Initialize a variable, say count as 183, representing the count of days to increment.
Iterate until the value of count is positive and perform the following steps:
- If the value of count is positive and curDate is at most number of days in the curMonth then decrement the value of count by 1 and increment the value of curDate by 1.
- If the value of count is 0 then break out of the loop.
- Update the value of curMonth by (curMonth + 1)%12.
After completing the above steps, print the date corresponding to curDate and curMonth as the result.

Below is the implementation of the above approach:

C++

// C++ program for the above approach

#include <iostream>
using namespace std;

// Function to find the date
// after the next half-year
void getDate(int d, string m) {

    // Stores the number of days in the
    // months of a leap year
    int days[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

    // List of months
    string month[] = {"January", "February",
             "March", "April",
             "May", "June",
             "July", "August",
             "September", "October",
             "November", "December"};

    // Days in half of a year
    int cnt = 183;

    // Index of current month
    int cur_month;
      for(int i = 0; i < 12; i++)
      if(m == month[i])
          cur_month = i;

    // Starting day
    int cur_date = d;

    while(1) {

        while(cnt > 0 && cur_date <= days[cur_month]) {

            // Decrement the value of
            // cnt by 1
            cnt -= 1;

            // Increment cur_date
            cur_date += 1;
        }

        // If cnt is equal to 0, then
        // break out of the loop
        if(cnt == 0)
            break;

        // Update cur_month
        cur_month = (cur_month + 1) % 12;

        // Update cur_date
        cur_date = 1;
    }

    // Print the resultant date
    cout << cur_date << " " << month[cur_month] << endl;
}

// Driver Code
int main() {

    int D = 15;
    string M = "January";

    // Function Call
    getDate(D, M);
      
    return 0;
}

// This code is contributed by Dharanendra L V.

Java

// Java program for the above approach
class GFG{
    
// Function to find the date
// after the next half-year
public static void getDate(int d, String m)
{
    
    // Stores the number of days in the
    // months of a leap year
    int[] days = { 31, 29, 31, 30, 31, 30,
                   31, 31, 30, 31, 30, 31 };

    // List of months
    String[] month = { "January", "February", "March",
                       "April", "May", "June", "July", 
                       "August", "September", "October",
                       "November", "December" };

    // Days in half of a year
    int cnt = 183;

    // Index of current month
    int cur_month = 0;
    for(int i = 0; i < 12; i++)
        if (m == month[i])
            cur_month = i;

    // Starting day
    int cur_date = d;

    while (true) 
    {
        while (cnt > 0 && cur_date <= days[cur_month])
        {
            
            // Decrement the value of
            // cnt by 1
            cnt -= 1;

            // Increment cur_date
            cur_date += 1;
        }

        // If cnt is equal to 0, then
        // break out of the loop
        if (cnt == 0)
            break;

        // Update cur_month
        cur_month = (cur_month + 1) % 12;

        // Update cur_date
        cur_date = 1;
    }

    // Print the resultant date
    System.out.println(cur_date + " " + 
                       month[cur_month]);
}

// Driver Code
public static void main(String args[])
{
    int D = 15;
    String M = "January";

    // Function Call
    getDate(D, M);
}
}

// This code is contributed by SoumikMondal

Python3

# Python program for the above approach

# Function to find the date
# after the next half-year
def getDate(d, m):

    # Stores the number of days in the
    # months of a leap year
    days = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]

    # List of months
    month = ['January', 'February',
             'March', 'April',
             'May', 'June',
             'July', 'August',
             'September', 'October',
             'November', 'December']

    # Days in half of a year
    cnt = 183

    # Index of current month
    cur_month = month.index(m)

    # Starting day
    cur_date = d

    while(1):

        while(cnt > 0 and cur_date <= days[cur_month]):

            # Decrement the value of
            # cnt by 1
            cnt -= 1

            # Increment cur_date
            cur_date += 1

        # If cnt is equal to 0, then
        # break out of the loop
        if(cnt == 0):
            break

        # Update cur_month
        cur_month = (cur_month + 1) % 12

        # Update cur_date
        cur_date = 1

    # Print the resultant date
    print(cur_date, month[cur_month])


# Driver Code
D = 15
M = "January"

# Function Call
getDate(D, M)

// C# program for the above approach
using System;

class GFG{
    
// Function to find the date
// after the next half-year
static void getDate(int d, string m)
{
    
    // Stores the number of days in the
    // months of a leap year
    int[] days = { 31, 29, 31, 30, 31, 30,
                   31, 31, 30, 31, 30, 31 };

    // List of months
    string[] month = { "January", "February", "March",
                       "April", "May", "June", "July", 
                       "August", "September", "October",
                       "November", "December" };

    // Days in half of a year
    int cnt = 183;

    // Index of current month
    int cur_month = 0;
    for(int i = 0; i < 12; i++)
        if (m == month[i])
            cur_month = i;

    // Starting day
    int cur_date = d;

    while (true) 
    {
        while (cnt > 0 && cur_date <= days[cur_month])
        {
            
            // Decrement the value of
            // cnt by 1
            cnt -= 1;

            // Increment cur_date
            cur_date += 1;
        }

        // If cnt is equal to 0, then
        // break out of the loop
        if (cnt == 0)
            break;

        // Update cur_month
        cur_month = (cur_month + 1) % 12;

        // Update cur_date
        cur_date = 1;
    }

    // Print the resultant date
    Console.WriteLine(cur_date + " " + 
                      month[cur_month]);
}

// Driver Code
public static void Main()
{
    int D = 15;
    string M = "January";

    // Function Call
    getDate(D, M);
}
}

// This code is contributed by ukasp

JavaScript

<script>

// Javascript program for the above approach

// Function to find the date
// after the next half-year
function getDate(d, m)
{
    
    // Stores the number of days in the
    // months of a leap year
    let days = [ 31, 29, 31, 30, 31, 30,
                 31, 31, 30, 31, 30, 31 ];
 
    // List of months
    let month = [ "January", "February", "March",
                  "April", "May", "June", "July",
                  "August", "September", "October",
                  "November", "December" ];
 
    // Days in half of a year
    let cnt = 183;
 
    // Index of current month
    let cur_month = 0;
    for(let i = 0; i < 12; i++)
        if (m == month[i])
            cur_month = i;
 
    // Starting day
    let cur_date = d;
 
    while (true)
    {
        while (cnt > 0 && cur_date <= days[cur_month])
        {
            
            // Decrement the value of
            // cnt by 1
            cnt -= 1;
 
            // Increment cur_date
            cur_date += 1;
        }
 
        // If cnt is equal to 0, then
        // break out of the loop
        if (cnt == 0)
            break;
 
        // Update cur_month
        cur_month = (cur_month + 1) % 12;
 
        // Update cur_date
        cur_date = 1;
    }
 
    // Print the resultant date
    document.write(cur_date + " " +
                   month[cur_month]);
}

// Driver Code
let D = 15;
let M = "January";

// Function Call
getDate(D, M);

// This code is contributed by susmitakundugoaldanga

</script>

Output:

16 July

Time Complexity: O(1)
Auxiliary Space: O(1)

Find the date after next half year from a given date

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