text: /*
   * Sync time. (Client-side)
   */
  global.SYNC_TIME = METHOD({
  
  	run : () => {
  		
  		let timeSyncRoom = UPPERCASE.ROOM('timeSyncRoom');
  		
  		timeSyncRoom.send({
  			methodName : 'sync',
  			data : new Date()
  		},
  
  		(diff) => {
  			
  			// The local time = The server time + diff (diff: client time - server time)
  			TIME.setDiff(diff);
  			
  			// The server time = The local time - diff (diff: client time - server time)
  			SERVER_TIME.setDiff(diff);
  			
  			timeSyncRoom.exit();
  		});
  	}
  });
  