ExpressJS TimeAgo View Helper

timeAgo.js

// helpers file

/*
 * JavaScript Pretty Date
 * Copyright (c) 2008 John Resig (jquery.com)
 * Licensed under the MIT license.
 * 
 * Small Modification by Jamund Ferguson to accept a real Date object
 */
exports.timeAgo = function(time) {
	var date = time instanceof Date ? time : new Date((time || "").replace(/-/g,"/").replace(/[TZ]/g," "))
	var diff = (((new Date()).getTime() - date.getTime()) / 1000)
	var day_diff = Math.floor(diff / 86400)
			
	if ( isNaN(day_diff) || day_diff < 0 || day_diff >= 31 )
		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";
}