Nodejs Year Leap Check isLeapYear()

Here you can find the source of isLeapYear()

Method Source Code

Date.prototype.isLeapYear = function() {
    var year = this.getFullYear();
    if((year & 3) != 0) return false;
    return ((year % 100) != 0 || (year % 400) == 0);
};

// Get Day of Year
Date.prototype.getDOY = function() {
    var dayCount = [0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334];
    var mn = this.getMonth();
    var dn = this.getDate();
    var dayOfYear = dayCount[mn] + dn;
    if(mn > 1 && this.isLeapYear()) dayOfYear++;
    return dayOfYear;
};

var dayOfYear = new Date().getDOY();
console.log(dayOfYear);//from w  ww  .j  a va2 s  .  c  om

Related

  1. isLeapYear()
    Date.prototype.isLeapYear = function() {
      var year = this.getFullYear();
      return !(year % 4) && (year % 100) || !(year % 400);
    
  2. isLeapYear()
    Date.prototype.isLeapYear = function() {
        var year = this.getFullYear();
        if ((year & 3) != 0) return false;
        return ((year % 100) != 0 || (year % 400) == 0);
    };
    
  3. isLeapYear()
    Date.prototype.isLeapYear = function () {
       return this.getFullYear()%4?0:this.getFullYear()%100?1:this.getFullYear%400?0:1
    
  4. isLeapYear()
    Date.isLeapYear = function(year) {
        return (((year % 4 === 0) && (year % 100 !== 0)) || (year % 400 === 0)); 
    };
    Date.getDaysInMonth = function(year, month) {
        return [31, (Date.isLeapYear(year) ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][month];
    };
    Date.prototype.isLeapYear = function() {
        return Date.isLeapYear(this.getFullYear()); 
    };
    ...
    
  5. isLeapYear()
    Date.prototype.isLeapYear = function(){
      return (0==this.getYear()%4 && ((this.getYear()%100 != 0) || (this.getYear()%400 == 0))); 
    
  6. isLeapYear()
    Date.prototype.isLeapYear = function () {
        var year = this.getFullYear();
        return ((year & 3) == 0 && (year % 100 || (year % 400 == 0 && year)));
    
  7. isLeapYear()
    Date.prototype.isLeapYear = function () {
      return new Date(this.getFullYear(), 1, 29).getDate() == 29;
    };