JavaScript Pretty Date for Unix Epoch Time originally by John Resig

prettyDateUnixEpochTime.js

/*
 * JavaScript Pretty Date
 * Copyright (c) 2011 John Resig (ejohn.org)
 * Originally Licensed under the MIT and GPL licenses.
 * Derivative work Copyright (c) 2016 Deveedutta Maharana (statusok200.wordpress.com)
 * Derivative work under MIT and GPL and WTFPL licenses.
 */

// Takes a Unix Epoch Time and returns a string representing how
// long ago the date represents.


function prettyDate( timeStamp ){
  var date = new Date ( timeStamp * 1000 ),
    diff = (((new Date()).getTime() - date.getTime()) / 1000),
    day_diff = Math.floor(diff / 86400);
      
  if ( isNaN(day_diff) || day_diff < 0 )
    return;

  return day_diff == 0 && (
      diff < 60 && "just now" ||
      diff < 120 && "1 minute ago" ||
      diff < 3600 && Math.floor( diff / 60 ) + " minutes ago" ||
      diff < 7200 && "1 hour ago" ||
      diff < 86400 && Math.floor( diff / 3600 ) + " hours ago") ||
    day_diff == 1 && "Yesterday" ||
    day_diff < 7 && day_diff + " days ago" ||
    day_diff < 31 && Math.ceil( day_diff / 7 ) + " weeks ago" ||
    day_diff >= 31 && day_diff < 365 && Math.ceil( day_diff / 31 ) + " months ago" ||
    day_diff >= 364 && Math.ceil( day_diff / 365 ) + " yrs ago";
}

// If jQuery is included in the page, adds a jQuery plugin to handle it as well
if ( typeof jQuery != "undefined" )
  jQuery.fn.prettyDate = function(){
    return this.each(function(){
      var date = prettyDate(this.title);
      if ( date )
        jQuery(this).text( date );
    });
  };

module.exports = prettyDate;