Nodejs Day Calculate getNumOfDays()

Method Source Code

Date.prototype.getNumOfDays = function()
{
    "use strict";
    var date = new Date(this.getFullYear(), this.getMonth() + 1, 0);
    return date.getDate();
};

Related

1. getDaysTillNow(since)

   Date.prototype.getDaysTillNow = function (since) {
       var past = new Date(since.getFullYear(), since.getMonth(), since.getDate());
       var today = new Date(this.getFullYear(), this.getMonth(), this.getDate());
       return (today - past) / (24 * 3600000);
   };
   

2. getDaysUntil(futureDay)

   Date.prototype.getDaysUntil = function(futureDay) {
       var future = new Date(futureDay.getFullYear(), futureDay.getMonth(), futureDay.getDate());
       var today = new Date(this.getFullYear(), this.getMonth(), this.getDate());
       return (future - today) / (24 * 3600000);
   };
   

3. getFistDay()

   Date.prototype.getFistDay = function () {
       var here = new Date(this.getFullYear(), this.getMonth(), 1);
       return here.getDay();
   };
   

4. getLocalTotalPassedDays()

   Date.prototype.getLocalTotalPassedDays = function() {
     return Math.floor((+this - this.getTimezoneOffset() * 60 * 1000) / 864e5);
   };
   

5. getNextDay()

   Date.prototype.getNextDay =function() {
      day = this.getDay()+1;  
     return (day);
   };
   var mydate = new Date('2016-01-09');
   document.write(mydate.toDateString()+"<br>");
   document.write(mydate.getNextDay());
   var d = new Date();
   document.write(d.getNextDay());
   ...
   

6. getStartOfDay()

   Date.prototype.getStartOfDay = function()
       var date = new Date(this);
       date.setHours(0);
       date.setMinutes(0);
       date.setSeconds(0);
       return date;
   

7. getThisDay()

   'use strict';
   Date.prototype.getThisDay = function()
       var date = new Date();
       return [date.setHours(0,0,0,0), date.setHours(23,59,59,999)];
   

8. getToday()

   Date.prototype.getToday = function () {
       return this.getFullYear()+'-'+this.getMonth()+'-'+this.getDate();
   

9. getToday()

   Date.prototype.getToday = function () {
       return this.getFullYear()+'-'+this.getMonth()+'-'+this.getDate();