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

Method Source Code

Date.prototype.isDST = Date.prototype.isDST || function() { //t is the date object to check, returns true if daylight saving time is in effect.
    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 = {};//from  w w w. j  a v a2  s.co m

Related

1. getNumOfDays()

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

2. getStartOfDay()

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

3. getThisDay()

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

4. getToday()

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

5. getToday()

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

6. isLastDay()

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

7. nextDayfunciton()

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

8. numDays()

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

9. 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(),
   ...