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Digital Clock with an alarm

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Hello everyone..I'm designing a digital clock using 7490 ic, 7447 ic and seven segment displays..I've completed the seconds and minutes portion...This clock is to be built in a 12 hr format....I couldn't figure out how to display 1 after 12 because it resets to zero...I have to display 1 after 12 and not 0. So, how do I do this? Hope you got the question...Also, I'm thinking of adding an alarm facility too..Any ideas regarding this?


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You could count 0 to 11 then add 1.
You could add a circuit that looks for "0" and then forces a extra count.
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