JavaScript: Get the quarter of the year

JavaScript Datetime: Exercise-15 with Solution

Quarter of Year

Write a JavaScript function to get the quarter (1 to 4) of the year.

Test Data:
console.log(quarter_of_the_year(new Date(2015, 1, 21)));
2
console.log(quarter_of_the_year(new Date(2015, 10, 18)));
4

Sample Solution:

JavaScript Code:

// Define a JavaScript function called quarter_of_the_year with parameter date
function quarter_of_the_year(date) 
{
  // Get the month component of the provided date and add 1 (as months are zero-based) and store it in the variable month
  var month = date.getMonth() + 1;
  // Calculate the quarter of the year by dividing the month by 3 and rounding up to the nearest integer
  return (Math.ceil(month / 3));
}

// Output the quarter of the year for the current date
console.log(quarter_of_the_year(new Date()));
// Output the quarter of the year for February 21, 2015
console.log(quarter_of_the_year(new Date(2015, 1, 21))); 
// Output the quarter of the year for November 18, 2015
console.log(quarter_of_the_year(new Date(2015, 10, 18)));

Output:

2
1
4

Explanation:

In the exercise above,

• The code defines a JavaScript function named "quarter_of_the_year()" with one parameter 'date', representing a Date object.
• Inside the function:
• It extracts the month component from the provided date using the "getMonth()" method, which returns a zero-based index representing the month (0 for January, 1 for February, etc.).
• It adds 1 to the month index to convert it to a 1-based index (1 for January, 2 for February, etc.) and stores it in the variable 'month'.
• It calculates the quarter of the year by dividing the month by 3 and rounding up to the nearest integer using "Math.ceil()".
• The function returns the calculated quarter of the year.
• The code then demonstrates the usage of the "quarter_of_the_year()" function by calling it with three different Date objects:
• The current date (obtained using new Date())
• February 21, 2015 (created using new Date(2015, 1, 21), where the month is 1 for February)
• November 18, 2015 (created using new Date(2015, 10, 18), where the month is 10 for November)
• Each console.log() call outputs the quarter of the year for the respective date to the console.

Flowchart:

Live Demo:

See the Pen JavaScript - Get the quarter of the year-date-ex- 15 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that returns the quarter of the year for a given Date object by mapping the month to quarter.
• Write a JavaScript function that calculates the quarter by dividing the month number by 3 and rounding up.
• Write a JavaScript function that accepts a date string, converts it to a Date, and outputs the corresponding quarter.
• Write a JavaScript function that handles edge cases when the month is December and ensures correct quarter calculation.

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