Beginners might find practical this article before using the Market clock I mentioned above: "Trading using Market 24h Clock" with trading recommendation below http://mc24.ch/strategy.html
By the way, you can download a free clock gadget on stocktime and use it in your windows sidebar:
http://stocktime.ru/en/screensaver.htm
http://stocktime.ru/en/images/gadget.png
And work on andriod and ios gadgets is in progress.