JavaScript: Get a numeric representation of a month

JavaScript Datetime: Exercise-26 with Solution

Numeric Month

Write a JavaScript function to get a numeric representation of a month, with leading zeros (01 through 12).

Test Data:
dt = new Date(2015, 10, 1);
console.log(numeric_month(dt));
"11"

Sample Solution:

JavaScript Code:

// Define a JavaScript function called numeric_month with parameter dt (date)
function numeric_month(dt)
{
  // Return the month in numeric format, ensuring that months below October are prefixed with '0'
  return (dt.getMonth() < 9 ? '0' : '') + (dt.getMonth() + 1); 
}

// Create a new Date object representing the current date
dt = new Date(); 
// Output the numeric representation of the month for the current date
console.log(numeric_month(dt)); 

// Create a new Date object representing November 1, 2015
dt = new Date(2015, 10, 1); 
// Output the numeric representation of the month for November 1, 2015
console.log(numeric_month(dt));

Output:

06
11

Explanation:

In the exercise above,

• The code defines a JavaScript function named "numeric_month()" with one parameter 'dt', representing a Date object.
• Inside the numeric_month function:
• It retrieves the month index from the provided Date object "dt" using the "getMonth()" method. Note that the month index is zero-based (0 for January, 1 for February, ..., 11 for December).
• It checks if the month index is less than 9 (indicating October or earlier) to determine whether the month needs a leading zero.
• It returns the numeric representation of the month, ensuring that months below October are prefixed with '0' to maintain a two-digit format.
• The code then demonstrates the usage of the "numeric_month()" function:
• It creates a new Date object "dt" representing the current date using 'new Date()'.
• It outputs the numeric representation of the month for the current date by calling the "numeric_month()" function with 'dt' and logging the result to the console.
• It creates another new Date object 'dt' representing November 1, 2015, using 'new Date(2015, 10, 1)'.
• It outputs the numeric representation of the month for November 1, 2015, by calling the "numeric_month()" function with 'dt' and logging the result to the console.

Flowchart:

Live Demo:

See the Pen JavaScript - Get a numeric representation of a month-date-ex-26 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript function that returns the numeric month from a Date object as a two-digit string with a leading zero.
• Write a JavaScript function that converts the month index to a numeric representation and pads it to two digits.
• Write a JavaScript function that formats a Date’s month number using String.padStart() for consistency.
• Write a JavaScript function that validates the Date input and returns the month as both a number and a formatted string.

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• JavaScript Date Exercises Home ↩
• JavaScript Exercises Home ↩

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