JavaScript: Get the number of days in a month

Last update on August 19 2022 21:50:50 (UTC/GMT +8 hours)

JavaScript Datetime: Exercise-3 with Solution

Write a JavaScript function to get the number of days in a month.

Test Data:
console.log(getDaysInMonth(1, 2012));
console.log(getDaysInMonth(2, 2012));
console.log(getDaysInMonth(9, 2012));
console.log(getDaysInMonth(12, 2012));
Output :
31
29
30
31

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Get days in Month</title>
</head>
<body>
</body>
</html>

JavaScript Code:

var getDaysInMonth = function(month,year) {
  // Here January is 1 based
  //Day 0 is the last day in the previous month
 return new Date(year, month, 0).getDate();
// Here January is 0 based
// return new Date(year, month+1, 0).getDate();
};
console.log(getDaysInMonth(1, 2012));
console.log(getDaysInMonth(2, 2012));
console.log(getDaysInMonth(9, 2012));
console.log(getDaysInMonth(12, 2012));

Sample Output:

Flowchart:

Live Demo:

See the Pen JavaScript - Get the number of days in a month-date-ex- 3 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript function to get the current date.
Next: Write a JavaScript function to get the month name from a particular date.