Nodejs Day in Month getDaysInMonth()

Method Source Code

Date.prototype.getDaysInMonth = function () {
    var m = this.getMonth() + 1,
        y = this.getFullYear();//w  w w  .  j a v  a2  s .com
    return /8|3|5|10/.test(--m) ? 30 : m == 1 ? (!(y % 4) && y % 100) || !(y % 400) ? 29 : 28 : 31;
};

Related

1. daysInMonth()

   Date.prototype.daysInMonth = function () {
     return new Date(this.getFullYear(), this.getMonth() + 1, 0).getDate();
   };
   

2. getDaysInMonth()

   Date.prototype.getDaysInMonth = function () {
       var here = new Date(this.getTime());
       here.setDate(32);
       return 32 - here.getDate();
   };
   

3. getDaysInMonth()

   Date.prototype.getDaysInMonth = function () {
       Date.daysInMonth[1] = this.isLeapYear() ? 29 : 28;
       return Date.daysInMonth[this.getMonth()];
   

4. getDaysInMonth()

   Date.prototype.getDaysInMonth = function() {
     return Date.getDaysInMonth(this.getFullYear(), this.getMonth());
   };
   

5. getDaysInMonth()

   Date.prototype.getDaysInMonth = function ()
       return Date.getDaysInMonth(this.getFullYear(), this.getMonth());
   };
   

6. getDaysInMonth(year, month)

   Date.getDaysInMonth = function(year, month) {
     return [
       31, (Date.isLeapYear(year) ? 29 : 28),
       31, 30, 31, 30, 31, 31, 30, 31, 30, 31
     ][month];
   };
   

7. getDaysInMonth(year, month)

   Date.getDaysInMonth = function (year, month)
       return [31, (Date.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
   };
   

8. getDaysInMonthOfYear()

   Date.prototype.getDaysInMonthOfYear = function(){
     month = this.getMonth();
     if(month === 1){
       return this.isLeapYear()? 29:28;
     }else{
       if(month>=8){
         return month%2? 31:30;
       }else{
         return month%2? 31:30;
   ...