How to get ‘how many days in February’ using Javascript?

2010-05-19

59 words - 1 min read

It is quite handy to have a function that can tell you how many days there are in February due to the leap year shift of either 28 or 29 days.
Below is a function created in Javascript to return the exact amount of days according to the year given:

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function daysInFebruary (year){
    return (((year%4==0)&&((!(year%100==0))||(year%400==0)))?29:28);
}