[ksa]

mikuskov, пробуй так...

var tutu;
	function getTime(zone, success) { 
		var url = 'http://json-time.appspot.com/time.json?tz=' + zone, 
			ud = 'json' + (+new Date()); 
		window[ud]= function(o){ 
			success && success(new Date(o.datetime)); 
		}; 
		document.getElementsByTagName('head')[0].appendChild((function() { 
			var s = document.createElement('script'); 
			s.type = 'text/javascript'; 
			s.src = url + '&callback=' + ud;
			return s;
		})()); 
	} 
	getTime('GMT', function(time){ 
		tutu = time.getHours();
	});
	alert(tutu);