Algorithm
Problem Name: 1185. Day of the Week
Problem Link: https://leetcode.com/problems/day-of-the-week/
Given a date, return the corresponding day of the week for that date.
The input is given as three integers representing the day, month and year respectively.
Return the answer as one of the following values {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}.
Example 1:
Input: day = 31, month = 8, year = 2019 Output: "Saturday"
Example 2:
Input: day = 18, month = 7, year = 1999 Output: "Sunday"
Example 3:
Input: day = 15, month = 8, year = 1993 Output: "Sunday"
Constraints:
- The given dates are valid dates between the years
1971and2100.
Code Examples
#1 Code Example with Java Programming
Code -
Java Programming
class Solution {
int[] m = {0,31,28,31,30,31,30,31,31,30,31,30,31};
String[] res = {"Friday", "Saturday", "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday"};
public String dayOfTheWeek(int day, int month, int year) {
int days = years(year);
if(isLeap(year))
m[2] = 29;
for(int i=0; i < month; i++){
days += m[i];
}
days += day-1;
return res[days%7];
}
private int years(int y){
int count = 0;
for(int i=1971; i < y; i++){
if(isLeap(i))
count += 366;
else
count += 365;
}
return count;
}
private boolean isLeap(int y){
if(y % 4 != 0) return false;
else if(y%100 != 0) return true;
else if(y % 400 != 0> return false;
else return true;
}
}
Input
day = 31, month = 8, year = 2019
Output
"Saturday"
#2 Code Example with Javascript Programming
Code -
Javascript Programming
const dayOfTheWeek = function(day, month, year) {
const weekdays = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];
const date = new Date(year,month-1,day).getDay();
return weekdays[date];
};
Input
day = 31, month = 8, year = 2019
Output
"Saturday"
#3 Code Example with Python Programming
Code -
Python Programming
from datetime import date
class Solution:
def dayOfTheWeek(self, day: int, month: int, year: int) -> str:
return date(year, month, day).strftime("%A")
Input
day = 18, month = 7, year = 1999
Output
"Sunday"
#4 Code Example with C# Programming
Code -
C# Programming
using System;
namespace LeetCode
{
public class _1185_DayOfTheWeek
{
public string DayOfTheWeek(int day, int month, int year)
{
return new DateTime(year, month, day).DayOfWeek.ToString();
}
}
}
Input
day = 18, month = 7, year = 1999
Output
"Sunday"