Nodejs Month Calculate getMonthStart()

Method Source Code

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

Related

1. getFirstDayOfMonth()

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

2. getLastDateInMonth(months)

   Date.prototype.getLastDateInMonth = function (months){
     months = parseInt(months);
     return new Date(this.getFullYear(), this.getMonth() + (months || 0) + 1, 0);
   

3. getLastDayOfMonth()

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

4. getMonth2()

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

5. getMonthEnd()

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

6. getShortMonth()

   Date.prototype.getShortMonth = function () {
      return ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"][this.getMonth()];
   };
   

7. getShortMonthName()

   Date.prototype.getShortMonthName = function () {
     var monthNames = ["Jan", "Feb", "Mar", "Apr", "May", "Jun",
       "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
     ];
     return monthNames[this.getMonth()];
   };
   

8. incrementMonth( iIncrementValue )

   var aMonths = [ 'January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December' ]
   var aDays = [ 'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday' ]
   Date.prototype.incrementMonth = function ( iIncrementValue )
     this.setMonth(
       this.getMonth() + iIncrementValue
     )
   Date.prototype.toDayString = function ()
   ...
   

9. isAfterMonth(d)

   Date.prototype.isAfterMonth = function (d) {
       var tDate = new Date(this.getFullYear(), this.getMonth(), this.getDate());
       var pDate = new Date(d.getFullYear(), d.getMonth(), d.getDate());
       if(tDate.getFullYear() < pDate.getFullYear()) return false;
       if(tDate.getMonth() < pDate.getMonth()) return false;
       return true;