getNumberDaysInMonth = function (inMonth,inYear) { inMonth = inMonth-1; var leap_year = this.isLeapYear(inYear); if (leap_year){ leap_year =1; }else{ leap_year = 0; } if(inMonth==3 ||inMonth==5 ||inMonth==8 ||inMonth==10){ return 30; }else if(inMonth ==1){ return 28+leap_year; }else{ return 31; } } isLeapYear =function (inYear) { if((inYear%4 ==0&&!(inYear%100==0))||inYear%400==0){ return true; }else{
return false;
} } var days = getNumberDaysInMonth(2,2016); console.log(days); //29