JavaScript Program to Check Leap Year

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What is Leap Year?

A leap year is a calendar year containing one additional day added to keep the calendar year synchronized with the astronomical or seasonal year. For example, 2024 is a leap year.

Tips: It is recommended to use our online Leap Year calculator for better understanding.

Condition for Leap Year

To check whether a year is a leap year or not, the year should satisfy at least one of the following two conditions

  1. A year should be exactly divisible by 4, but, not by 100.
  2. A year should be exactly divisible by 4, 100 and 400 at the same time.

Check Leap Year

In the following example, we will check whether the given year (2012) is leap year or not.


HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Leap Year or Not</h1> <script> var year = 2012; if(year % 4 == 0) { if((year % 100 == 0) && (year % 400 != 0)) document.write(year +" is not a leap year"); else document.write(year +" is a leap year"); } else document.write(year+" is not a leap year"); </script> </body> </html>

Leap Years between the Given Range

In the following example, we will find all the Leap Years between 2000 and 2030.


HTML Online Editor
<!DOCTYPE html> <html> <body> <h1>JS Find All Leap Years</h1> <script> var start = 2000; var end = 2030; var flag = 0; document.write("Leap year(s) between "+start+" to "+end+":<br>"); for(start = start; start <= end; start++) { if(start % 4 == 0) { if((start % 100 == 0) && (start % 400 != 0)) { //Not a leap year } else { flag = 1; document.write(start+", "); } } } if(flag == 0) document.write("There is no leap year between between the given range"); </script> </body> </html>


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