Nodejs Month Calculate getLastDateInMonth(months)

Method Source Code

/**/*from  w  w w .j a va2  s . c om*/
* Return last date in month from "date + months"
*
* @param   {date}
*/
Date.prototype.getLastDateInMonth = function (months){
  months = parseInt(months);
  return new Date(this.getFullYear(), this.getMonth() + (months || 0) + 1, 0);
}

Related

1. countDaysMonth()

   Date.prototype.countDaysMonth = function () {
       var monthStart = new Date(this);
       var monthEnd = new Date(this);
       monthEnd.setMonth(monthEnd.getMonth() + 1);
       var qtdeDias = Math.round((monthEnd - monthStart) / (1000 * 60 * 60 * 24));
       return qtdeDias
   };
   

2. end_of_month()

   Date.prototype.end_of_month = function() {
     var month = this.getMonth() + 1;
     var year = this.getFullYear();
     if (month > 11) {
       month = 0;
       year++;
     return new Date(year, month, 0);
   

3. getAbbrMonth()

   Date.prototype.getAbbrMonth = function() {
     switch(this.getMonth()) {
       case 0: return 'Jan';
       case 1: return 'Feb';
       case 2: return 'March';
       case 3: return 'Apr';
       case 4: return 'May';
       case 5: return 'Jun';
       case 6: return 'July';
   ...
   

4. getCurrentMonthDays()

   Date.prototype.getCurrentMonthDays = function(){
           var thisTime = this.getTime();
           if(this.getMonth() == 11){
               this.setYear(this.getYear()+1);
               this.setMonth(0);
           else{
               this.setMonth(this.getMonth()+1);
           var currentDays = parseInt((this.getTime()-thisTime)/1000/60/60/24);
           this.setTime(thisTime);
           return currentDays; 
   

5. getFirstDayOfMonth()

   Date.prototype.getFirstDayOfMonth = function () {
       var day = (this.getDay() - (this.getDate() - 1)) % 7;
       return (day < 0) ? (day + 7) : day;
   

6. getLastDayOfMonth()

   Date.prototype.getLastDayOfMonth = function () {
       var day = (this.getDay() + (Date.daysInMonth[this.getMonth()] - this.getDate())) % 7;
       return (day < 0) ? (day + 7) : day;
   

7. getMonth2()

   Date.prototype.getMonth2 = function () {
      var month = this.getMonth() + 1;
      return (month < 10 ? '0' : '') + month;
   };
   

8. getMonthEnd()

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

9. getMonthStart()

   Date.prototype.getMonthStart = function () {
     return new Date(this.getFullYear(), this.getMonth(), 1);
   };