Nodejs Date Convert toRelativeTime( now_threshold )

Method Source Code

Date.prototype.toRelativeTime = function( now_threshold ) {
   var delta = new Date() - this;
   //  w w  w.ja v a2  s.c  o  m
   now_threshold = parseInt(now_threshold, 10);
   
   if (isNaN(now_threshold)) {
      now_threshold = 0;
   }
   
   if (delta <= now_threshold) {
      return 'Just now';
   }
   
   var units = null;
   var conversions = {
       millisecond : 1, // ms -> ms
       second : 1000, // ms -> sec
       minute : 60, // sec -> min
       hour : 60, // min -> hour
       day : 24, // hour -> day
       month : 30, // day -> month (roughly)
       year : 12
   // month -> year
   };
   
   for ( var key in conversions) {
      if (delta < conversions[key]) {
         break;
      }
      else {
         units = key; // keeps track of the selected key over the
                     // iteration
         delta = delta / conversions[key];
      }
   }
   
   // pluralize a unit when the difference is greater than 1.
   delta = Math.floor(delta);
   if (delta !== 1) {
      units += "s";
   }
   return [ delta, units ].join(" ");
};

/*
 * Wraps up a common pattern used with this plugin whereby you take a String
 * representation of a Date, and want back a date object.
 */
Date.fromString = function( str ) {
   return new Date(Date.parse(str));
};

Related

1. toOADate()

   Date.prototype.toOADate = function ()
     var jsDate = this || new Date();
     var timezoneOffset = jsDate.getTimezoneOffset() / (60 * 24);
     var msDateObj = (jsDate.getTime() / 86400000) + (25569 - timezoneOffset);
     return msDateObj;
   

2. toRFC2822()

   Date.prototype.toRFC2822 = function() {    
       return [
             Date.DAYS[this.getDay()] + ","
           , Date.padZero(this.getDate())
           , Date.MONTHS[this.getMonth()]
           , this.getFullYear()
           , this.getTimeString()
           , this.getTimezoneOffsetString()
       ].join(" ");
   ...
   

3. toRFC3339()

   Date.prototype.toRFC3339 = function()
     var year = this.getFullYear();
     var month = this.getMonth()+1;  
     var date = this.getDate();
     var hours = this.getHours();
     var mins = this.getMinutes();
     var secs = this.getSeconds();
     return (year+'-'+month+'-'+date+' '+hours+':'+mins+':'+secs);
   ...
   

4. toRails(name)

   Date.prototype.toRails = function(name) {
      var dateParams;
      dateParams = {};
      dateParams[name + "(1i)"] = this.getFullYear();
      dateParams[name + "(2i)"] = this.getMonth() + 1;
      dateParams[name + "(3i)"] = this.getDate();
      dateParams[name + "(4i)"] = this.getHours();
      dateParams[name + "(5i)"] = this.getMinutes();
      return dateParams;
   ...
   

5. toReadableTime()

   Date.prototype.toReadableTime = function() {
     if(this.getHours()>0) {
       return this.getHours()+"h "+this.getMinutes()+" min"
     } else {
       return this.getMinutes()+" min"
   

6. toRelativeTime()

   Date.prototype.toRelativeTime = function() {
     var delta       = new Date() - this;
     var units       = null;
     var conversions = {
       millisecond: 1, 
       second: 1000,   
       minute: 60,     
       hour:   60,     
       day:    24,     
   ...
   

7. toRelativeTime(now_threshold)

   Date.prototype.toRelativeTime = function(now_threshold) {
     var delta = new Date() - this;
     now_threshold = parseInt(now_threshold, 10);
     if (isNaN(now_threshold)) {
       now_threshold = 0;
     if (delta <= now_threshold) {
       return 'Just now';
     var units = null;
     var conversions = {
       millisecond: 1, 
       second: 1000,   
       minute: 60,     
       hour:   60,     
       day:    24,     
       month:  30,     
       year:   12      
     };
     for (var key in conversions) {
       if (delta < conversions[key]) {
         break;
       } else {
         units = key; 
         delta = delta / conversions[key];
     delta = Math.floor(delta);
     if (delta !== 1) { units += "s"; }
     return [delta, units, "ago"].join(" ");
   };
   

8. toRelativeTime(now_threshold)

   Date.prototype.toRelativeTime = function(now_threshold) {
     var delta = new Date() - this;
     now_threshold = parseInt(now_threshold, 10);
     if (isNaN(now_threshold)) {
       now_threshold = 0;
     if (Math.abs(delta) <= now_threshold) {
       return 'Just now';
     var units = null;
     var conversions = {
       millisecond: 1, 
       second: 1000,   
       minute: 60,     
       hour:   60,     
       day:    24,     
       month:  30,     
       year:   12      
     };
     for (var key in conversions) {
       if (Math.abs(delta) < conversions[key]) {
         break;
       } else {
         units = key; 
         delta = delta / conversions[key];
     delta = delta > 0 ? Math.floor(delta) : Math.ceil(delta);
     if (Math.abs(delta) !== 1) { units += "s"; }
     if (delta > 0) {
       return [delta, units, "ago"].join(" ");
     } else {
       return ["in", -delta, units].join(" ");
   };
   Date.fromString = function(str) {
     return new Date(Date.parse(str));
   };
   

9. toShortTime()

   Date.prototype.toShortTime = function() {
       return ('0' + this.getHours()).slice(-2) + ':' + ('0' + this.getMinutes()).slice(-2);