JavaScript: Get a full textual representation of the day of the week

JavaScript Datetime: Exercise-21 with Solution

Full Weekday Name

Write a JavaScript function to get a full textual representation of the weekday (Sunday through Saturday).

Test Data:
dt = new Date(2015, 10, 1);
console.log(long_Days(dt));
"Sunday"

Sample Solution:

JavaScript Code:

// Define a property 'longDays' on the Date object to store an array of long day names
Date.longDays = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'];

// Define a JavaScript function called long_Days with parameter dt (date)
function long_Days(dt)
{ 
  // Return the long day name corresponding to the day of the week of the provided date
  return Date.longDays[dt.getDay()]; 
}

// Create a new Date object representing the current date
dt = new Date();
// Output the long day name for the current date
console.log(long_Days(dt));

// Create a new Date object representing November 1, 2015
dt = new Date(2015, 10, 1);
// Output the long day name for November 1, 2015
console.log(long_Days(dt));

Output:

Tuesday
Sunday

Explanation:

In the exercise above,

• The code defines a property 'longDays' on the "Date" object, which is an array containing full day names ('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday').
• It then defines a JavaScript function named "long_Days()" with one parameter 'dt', representing a Date object.
• Inside the long_Days function:
• It retrieves the day of the week (0 for Sunday, 1 for Monday, ..., 6 for Saturday) from the provided Date object 'dt' using the "getDay()" method.
• It uses this day of the week as an index to access the corresponding full day name from the 'Date.longDays' array.
• It returns the full day name.
• The code then demonstrates the usage of the "long_Days()" function:
• It creates a new Date object 'dt' representing the current date (new Date()).
• It outputs the full day name for the current date by calling the "long_Days()" function with 'dt' and logging the result to the console.
• It creates another new Date object 'dt' representing November 1, 2015 (new Date(2015, 10, 1)).
• It outputs the full day name for November 1, 2015 by calling the "long_Days()" function with 'dt' and logging the result to the console.

Flowchart:

Live Demo:

See the Pen JavaScript - Get a full textual representation of the day of the week-date-ex-21 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that returns the full name of the weekday from a Date object using an array of full day names.
• Write a JavaScript function that converts a numeric day from getDay() into its full weekday name.
• Write a JavaScript function that accepts a date string and outputs the full weekday name after conversion to a Date object.
• Write a JavaScript function that supports locale-specific weekday names based on a provided locale code.

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