Nodejs Day Calculate past(pattern,pastDays)

Method Source Code

Date.prototype.past = function(pattern,pastDays){
    var pastday = new Date((this - 0) - 1000*60*60*24*pastDays);
    var pattern = pattern;    //    YYYY-MM-DD ? MM-DD-YYYY ? YYYY-MM-DD , hh : mm : ss
    var dateObj = {
        "Y" : pastday.getFullYear(),
        "M" : pastday.getMonth()+1,
        "D" : pastday.getDate(),
        "h" : pastday.getHours(),
        "m" : pastday.getMinutes(),
        "s" : pastday.getSeconds()
    };/*  www . ja  va 2 s .  com*/
    return pattern.replace(/YYYY|MM|DD|hh|mm|ss/g,function(match){
        switch(match){
            case "YYYY" :
                return dateObj.Y;
            case "MM" :
                return dateObj.M;
            case "DD" :
                return dateObj.D;
            case "hh" :
                return dateObj.h;
            case "mm" :
                return dateObj.m;
            case "ss" :
                return dateObj.s;
        };
    });
};

Related

1. getToday()

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

2. isDST() //t is the date object to check, returns true if daylight saving time is in effect.

   Date.prototype.isDST = Date.prototype.isDST || function() { 
       var jan = new Date(this.getFullYear(),0,1);
       var jul = new Date(this.getFullYear(),6,1);
       return Math.min(jan.getTimezoneOffset(),jul.getTimezoneOffset()) == this.getTimezoneOffset();
   };
   exports.DataUtilities = {};
   

3. isLastDay()

   Date.prototype.isLastDay = function(){
       if(!this.isToDay()){
           var today = new Date();
           return this.getTime() < today.getTime();
       return false;
   };
   

4. nextDayfunciton()

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

5. numDays()

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

6. 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;
   };
   

7. 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()];
   

8. setToMondayMidnight()

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

9. 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);
   ...