var myDate = function(id) {
	var obj = document.getElementById(id);
	obj.setAttribute('format', obj.innerHTML);
	
	var renew = function() {
		var date = new Date();
		var d = date.getDate();
		var M = date.getMonth() + 1;
		var y = date.getFullYear();
		M < 10 ? M = '0' + M : M;
		obj.innerHTML = obj.getAttribute('format').replace(/(%d)/g, d).replace(/(%M)/g, M).replace(/(%y)/g, y);
	}
	renew();
	window.setInterval(renew, 1000);
}

myDate('date');