Handlebars helper for converting unix timestamp in seconds to pretty date - "25 seconds ago" / "3 minutes ago" / "2 hours ago" / "2 days ago" / "December 25"

gistfile1.js

/**
	@param {UNIX timestamp} timestamp - an unix timestamp in seconds
*/
Handlebars.registerHelper("prettyDate", function (timestamp) {

	var date,
		monthNames,
		secs = ((new Date()).getTime() / 1000) - timestamp,
		minutes = secs / 60,
		hours = minutes / 60,
		days = hours / 24,
		weeks = days / 7,
		months = weeks / 4.34812,
		years = months / 12;
    
    if (minutes < 1) {
    	secs = Math.floor(secs % 60);
        return secs + (secs > 1 ? " seconds ago" : " second ago");
    }
    if (hours < 1) {
    	hours = Math.floor(minutes % 60);
        return hours + (minutes > 1 ? " minutes ago" : " minute ago");
    }
    if (days < 1) {
    	hours = Math.floor(hours % 24);
        return hours + (hours > 1 ? " hours ago" : " hour ago");
    }
    else if (days < 4) {
    	days = Math.floor(days % 7);
    	return days + (days > 1 ? " days ago" : " day ago");
    }
    else {
    	date = new Date(timestamp * 1000);
    	monthNames = [ "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" ];
    	return monthNames[date.getMonth()] + " " + date.getDate();
    }
    
});