Nodejs Time Calculate timeStr()

Method Source Code

/* CONSTANTS ****************************************************************/
var DAY_WIDTH = 100;
var DAY_HEIGHT = 80;
var SIDE_DELTA = 2;

var DAY_HEADING = ["SUN",
                   "MON",
                   "TUE",
                   "WED",
                   "THU",
                   "FRI",
                   "SAT"];

var MONTH_NAMES = ["JANUARY",
                   "FEBRUARY",
                   "MARCH",
                   "APRIL",
                   "MAY",
                   "JUNE",
                   "JULY",
                   "AUGUST",
                   "SEPTEMBER",
                   "OCTOBER",
                   "NOVEMBER",
                   "DECEMBER"];





Date.prototype.timeStr = function ()
{
  var hr = this.getHours();
  var pm = false;

  if (hr > 12)
  {/*from ww  w. j  a  va 2  s . c  om*/
    hr -= 12;
    pm = true;
  }
  else if (hr == 12)
  {
    pm = true;
  }
  else if (hr == 0)
  {
    hr = 12;
  }

  var min = this.getMinutes().toString();
  if (min.length == 1)
  {
    min = "0".concat(min);
  }

  return hr + ":" + min + (pm ? "p" : "a");
};
/* ADDING METHODS TO Date ****************************************************/
Date.prototype.daysIn = function ()
{
  return (new Date(this.getFullYear(), this.getMonth()+1, 0)).getDate();
};

Date.prototype.getYearMonth = function ()
{
  return ((this.getFullYear())*12 + this.getMonth());
}

Date.prototype.plusMonth = function ()
{
  if (this.getMonth() == 11)
  {
    return new Date(this.getFullYear()+1, 0, this.getDate(), this.getHours(),
                    this.getMinutes(), this.getMilliseconds());
  }
  else
  {
    return new Date(this.getFullYear(), this.getMonth()+1, this.getDate(), 
                    this.getHours(), this.getMinutes(), 
                    this.getMilliseconds());
  }
}

Date.prototype.minusMonth = function ()
{
  if (this.getMonth() == 0)
  {
    return new Date(this.getFullYear()-1, 11, this.getDate(), this.getHours(),
                    this.getMinutes(), this.getMilliseconds());
  }
  else
  {
    return new Date(this.getFullYear(), this.getMonth()-1, this.getDate(), 
                    this.getHours(), this.getMinutes(), 
                    this.getMilliseconds());
  }
}

Related

1. timeAgo(date)

   String.prototype.format = function(obj) {
     var args = arguments;
     var str = this;
     return str.replace(/\{[\w\d_-]+\}/g, function(part) {
       part = part.slice(1, -1);
       var index = parseInt(part, 10);
       if (isNaN(index)) {
         return obj[part];
       } else {
   ...
   

2. timeAgoInWords(relativeDate)

   "use strict";
   Date.prototype.timeAgoInWords = function (relativeDate) {
       var delta;
       relativeDate = relativeDate || new Date();
       delta = parseInt((relativeDate.getTime() - this) / 1000, 10);
       if (delta < 60) {
           return 'less than a minute ago';
       } else if (delta < 120) {
         return 'about a minute ago';
   ...
   

3. timeFmt(aDate)

   var timeFmt = function (aDate) {
       if (null == aDate) {
           return "";
       else {
           return new Date(aDate).format("yyyy-MM-dd hh:mm:ss");
   };
   

4. timeSecond()

   Date.prototype.timeSecond = function () {
        return ((this.getSeconds() < 10)?"0":"") + this.getSeconds();
   

5. timeSince(date)

   String.prototype.startsWith = function (str){
     return this.indexOf(str) === 0;
   };
   timeSince = function (date) {
     var seconds = Math.floor((new Date() - date) / 1000);
     var interval = Math.floor(seconds / 31536000);
     if (interval >= 1) {
         if(interval == 1){
           return "about " + interval + " year ago";
   ...
   

6. timeToJSON()

   Date.prototype.timeToJSON = function() {
     return this.toLocaleTimeString().substring(0,5);
   };
   

7. timeToMidnight()

   Date.prototype.timeToMidnight = function() {
       this.setHours(0);
       this.setMinutes(0);
       this.setMilliseconds(0);
   };
   

8. time_ago_in_words(date)

   function time_between_in_words(from_date, to_date)
     return format_milliseconds(Math.abs(from_date.getTime()-to_date.getTime()));
   function time_ago_in_words(date)
     return format_milliseconds(Math.abs(Date.now()-date.getTime()));
   function format_milliseconds(milsecs)
   ...
   

9. time_since()

   var chunks = [
     [60 * 60 * 24 * 365, 'year'],
     [60 * 60 * 24 * 30, 'month'],
     [60 * 60 * 24 * 7, 'week'],
     [60 * 60 * 24, 'day'],
     [60 * 60, 'hour'],
     [60, 'minute']
   ];
   Date.prototype.time_since = function() {
   ...