JavaScript: Find 1st January be a Sunday between a range of years

JavaScript Basic: Exercise-7 with Solution

Write a JavaScript program to find out if 1st January will be a Sunday between 2014 and 2050.

To find out which years between 2014 and 2050 have 1st January falling on a Sunday, we can use the following approach:

• Loop through each year between 2014 and 2050 and check if the 1st January of that year falls on a Sunday.
• To check if the 1st January of a year is a Sunday, we can use the Date object in JavaScript. Create a Date object for the 1st January of each year and use the getDay() method to get the day of the week. The getDay() method returns an integer between 0 and 6, where 0 represents Sunday, 1 represents Monday, and so on.
• If the day of the week is 0 (Sunday), we can print out the year.

Here is the algorithm in pseudocode:

for year = 2014 to 2050 do
    create a Date object for 1st January of year
    if day of the week of Date object is Sunday then
        print year
    end if
end for

Using this approach, we can find out that the years with 1st January falling on a Sunday between 2014 and 2050.

Sample Solution:

JavaScript Code:

// Log a separator to visually distinguish the output
console.log('--------------------');

// Loop through the years from 2014 to 2050 (inclusive)
for (var year = 2014; year <= 2050; year++) {
    // Create a Date object for January 1st of the current year
    var d = new Date(year, 0, 1);

    // Check if January 1st is a Sunday (where Sunday corresponds to day index 0)
    if (d.getDay() === 0) {
        // Log a message if January 1st is a Sunday for the current year
        console.log("1st January is being a Sunday  " + year);
    }
}

// Log another separator to conclude the output
console.log('--------------------'); 

Output:

--------------------
1st January is being a Sunday  2017
1st January is being a Sunday  2023
1st January is being a Sunday  2034
1st January is being a Sunday  2040
1st January is being a Sunday  2045
--------------------

Live Demo:

See the Pen JavaScript: Sunday 2014 and 2050 - basic-ex-7 by w3resource (@w3resource) on CodePen.

Explanation:

Declaring a JavaScript date : In JavaScript Date objects are based on a time value that is the number of milliseconds since 1 January, 1970 UTC. You can declare a date in the following ways :

new Date();
new Date(value);
new Date(dateString);
new Date(year, month[, day[, hour[, minutes[, seconds[, milliseconds]]]]]);

The getDay() method is used to get the day of the week for the specified date according to local time, where 0 represents Sunday. The value returned by getDay() is an integer corresponding to the day of the week: 0 for Sunday, 1 for Monday, 2 for Tuesday, and so on.

Flowchart:

ES6 Version:

// Log a separator to visually distinguish the output
console.log('--------------------');

// Loop through the years from 2014 to 2050 (inclusive)
for (let year = 2014; year <= 2050; year++) {
    // Create a Date object for January 1st of the current year
    const d = new Date(year, 0, 1);

    // Check if January 1st is a Sunday (where Sunday corresponds to day index 0)
    if (d.getDay() === 0) {
        // Log a message if January 1st is a Sunday for the current year using template literals
        console.log(`1st January is being a Sunday  ${year}`);
    }
}

// Log another separator to conclude the output
console.log('--------------------');

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