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To Relative Time

/ Published in: JavaScript
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* Returns a description of this past date in relative terms.
* Takes an optional parameter (default: 0) setting the threshold in ms which
* is considered "Just now".
*
* Examples, where new Date().toString() == "Mon Nov 23 2009 17:36:51 GMT-0500 (EST)":
*
* new Date().toRelativeTime()
* --> 'Just now'
*
* new Date("Nov 21, 2009").toRelativeTime()
* --> '2 days ago'
*
* // One second ago
* new Date("Nov 23 2009 17:36:50 GMT-0500 (EST)").toRelativeTime()
* --> '1 second ago'
*
* // One second ago, now setting a now_threshold to 5 seconds
* new Date("Nov 23 2009 17:36:50 GMT-0500 (EST)").toRelativeTime(5000)
* --> 'Just now'
*
*/

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  1. Date.prototype.toRelativeTime = function(now_threshold) {
  2.   var delta = new Date() - this;
  3.  
  4.   now_threshold = parseInt(now_threshold, 10);
  5.  
  6.   if (isNaN(now_threshold)) {
  7.     now_threshold = 0;
  8.   }
  9.  
  10.   if (delta <= now_threshold) {
  11.     return 'Just now';
  12.   }
  13.  
  14.   var units = null;
  15.   var conversions = {
  16.     millisecond: 1, // ms    -> ms
  17.     second: 1000,   // ms    -> sec
  18.     minute: 60,     // sec   -> min
  19.     hour:   60,     // min   -> hour
  20.     day:    24,     // hour  -> day
  21.     month:  30,     // day   -> month (roughly)
  22.     year:   12      // month -> year
  23.   };
  24.  
  25.   for (var key in conversions) {
  26.     if (delta < conversions[key]) {
  27.       break;
  28.     } else {
  29.       units = key; // keeps track of the selected key over the iteration
  30.       delta = delta / conversions[key];
  31.     }
  32.   }
  33.  
  34.   // pluralize a unit when the difference is greater than 1.
  35.   delta = Math.floor(delta);
  36.   if (delta !== 1) { units += "s"; }
  37.   return [delta, units].join(" ");
  38. };

URL: https://raw.github.com/ry/node_chat/master/client.js

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