Nodejs Time Calculate color (datetime)

Method Source Code

Array.prototype.forEach.call(document.querySelectorAll('main > ul li'), function (el) {
   el.style.color = color(el.dataset.datetime);
});//from www  .  ja va 2  s.  c  o m

function color (datetime) {
   if (!datetime) { return; }

   var date = new Date(datetime);
   var ago = (new Date() - date) / (8.64e+7 * 365); // in years
   var day = Math.ceil((date - new Date(date.getFullYear(), 0, 1)) / 8.64e+7);

   var hue = Math.floor(360 * day / 365);
   var sat = 100 * Math.max(0, 1 - ago / 10);
   return 'hsl(' + hue + ',' + sat + '%,50%)';
}

Related

1. addTime( time )

   Date.prototype.addTime = function ( time ) {
     this.setTime( this.getTime() + time );
   };
   Date.prototype.addMinutes = function ( minutes ) {
     this.setMinutes( this.getMinutes() + minutes )
   };
   Date.prototype.addHours = function ( hours ) {
     this.setHours( this.getHours() + hours );
   };
   ...
   

2. currentTimeColor()

   Date.prototype.currentTimeColor = function() {
       return "#" + ((this.getHours() < 10)?"0":"") + this.getHours() + ((this.getMinutes() < 10)?"0":"") + this.getMinutes() + ((this.getSeconds() < 10)?"0":"") + this.getSeconds();
   };
   

3. dateTime()

   Date.prototype.dateTime = function() {
      var yyyy = this.getFullYear().toString();
      var mm = (this.getMonth()+1).toString(); 
      var dd  = this.getDate().toString();
      var hh = this.getHours().toString();
      var min = this.getMinutes().toString();
      var sec = this.getSeconds().toString();
      var time = (hh[1]?hh:"0"+hh[0]) + ":" + (min[1]?min:"0"+min[0]) + ":" + (sec[1]?sec:"0"+sec[0]);
      var date = (dd[1]?dd:"0"+dd[0]) + "/" + (mm[1]?mm:"0"+mm[0]) + "/" + yyyy;
   ...
   

4. datetime()

   Date.prototype.datetime = function() {
     var y = this.getFullYear();
     var M = this.getMonth() + 1;
     var d = this.getDate();
     var h = this.getHours();
     var m = this.getMinutes();
     var s = this.getSeconds();
     M = M < 10 ? '0' + M : M;
     d = d < 10 ? '0' + d : d;
   ...
   

5. distance_of_time_in_words(to)

   Date.prototype.distance_of_time_in_words = function(to) {
     distance_in_milliseconds = to - this;
     distance_in_minutes = Math.round(Math.abs(distance_in_milliseconds / 60000));
     if (distance_in_minutes == 0) {
       words = "less than a minute";
     } else if (distance_in_minutes == 1) {
       words = "1 minute";
     } else if (distance_in_minutes < 45) {
       words = distance_in_minutes + " minutes";
   ...