epochToAgo.js

function epochToAgo ( epoch ) {
	var rightNowObj = new Date();
	var rightNowEpoch = Math.floor(rightNowObj.getTime() / 1000);

	var diff = rightNowEpoch - epoch;
	var human;

	if ( diff < 3600 ) {
		human = Math.floor( diff / 60 ) + ' minutes ago';
	} else if ( diff < 86400 ) {
		human = Math.floor( diff / 3600 ) + ' hours ago';
	} else {
		var then = new Date();
		then.setTime( epoch * 1000 );
		human = then.toDateString().substr( 4, 6 );
	}
	return human;
}