Nodejs Day Calculate setToMondayMidnight()

Method Source Code

/**//  ww  w  . j  av  a 2  s.com
 * Sets the current Date object to the first day (Monday) of the week. Time is then set to 0:00 (midnight).
 */
Date.prototype.setToMondayMidnight = function() {
    var weekDay = this.getDay();
    // Sundays are 0. We need them to be 7.
    if (weekDay === 0) { 
        weekDay = 7;
    }
    // var mondayDate = new Date(this);
    this.setDate(this.getDate() - weekDay + 1);
    this.timeToMidnight();
};

Related

1. nextDayfunciton()

   Date.prototype.nextDay = funciton() {
     let today = this.getDate();
     return new Date(this.setDate(today + 1));
   

2. numDays()

   Date.prototype.numDays = function() {
     var d = new Date(this.getFullYear(), this.getMonth() + 1, 0);
     return d.getDate();
   };
   

3. past(pattern,pastDays)

   Date.prototype.past = function(pattern,pastDays){
       var pastday = new Date((this - 0) - 1000*60*60*24*pastDays);
       var pattern = pattern;    
       var dateObj = {
           "Y" : pastday.getFullYear(),
           "M" : pastday.getMonth()+1,
           "D" : pastday.getDate(),
           "h" : pastday.getHours(),
           "m" : pastday.getMinutes(),
   ...
   

4. 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;
   };
   

5. 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()];
   

6. 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);
   ...
   

7. 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;
   };
   ...
   

8. subDays(value)

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

9. 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++;
   ...