Nodejs Day Calculate subDays(value)

Method Source Code

Date.prototype.subDays = function(value) {
   this.setDate(this.getDate() - value);

   return this;/*from w w  w .  j  a va 2 s  .co m*/
};

Related

1. relativeDays()

   Date.prototype.relativeDays = function() {
     var now = new Date();
     var interval = now.getTime() - this.getTime();
     interval = Math.floor(interval / (1000 * 60 * 60 * 24));
     return interval;
   };
   

2. sGetDay()

   var weekdays = ["monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday"];
   Date.prototype.sGetDay = function() {
     return (this.getDay() + 6) %7;
   var d = new Date();
   var today = weekdays[d.sGetDay()];
   

3. setToMondayMidnight()

   Date.prototype.setToMondayMidnight = function() {
       var weekDay = this.getDay();
       if (weekDay === 0) { 
           weekDay = 7;
       this.setDate(this.getDate() - weekDay + 1);
       this.timeToMidnight();
   };
   

4. shiftDays(days)

   Date.prototype.shiftDays = function(days){    
     days = parseInt(days, 10);
     this.setDate(this.getDate() + days);
     return this;
   $date = new Date(2014, 9, 16,0,1);
   $date.shiftDays(1);
   console.log($date-"");
   $date.shiftDays(1);
   ...
   

5. subDays(value)

   Date.parseDate = function (date, format) {
     if (format === undefined)
       format = 'Y-mm-dd';
     return new Date(moment(date, format).valueOf());
   };
   Date.prototype.subDays = function (value) {
     this.setDate(this.getDate() - value);
     return this;
   };
   ...
   

6. subtract(days)

   const times = [1000, 10000, 100000, 1000000, 5000000];
   let x = 0;
   Date.prototype.subtract = function(days) {
     return new Date(this.setDate(this.getDate() - days));
   for(i in times) {
     console.time('monkeypatch ' + times[i]);
     while (x < times[i]) {
       x++;
   ...
   

7. subtractDays(days)

   Date.prototype.subtractDays=function(days){
       if (arguments.length===1){
           if (typeof days !== 'number') return;
           this.setDate(this.getDate() - days);
           return this;
       return this;
   

8. yestoday(pattern)

   Date.prototype.yestoday = function(pattern){
       return this.past(pattern,1);
   };