Man oh man...

I'm home from work and it's time to play.... Ready?

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Following the logic presented below, find the missing number in the third scenario. (Okay, on the goofy calendar they have these in circles - I'll do my best to re-create the look).

1 / 3
-----
12
****
2 / 5
-----
21
****
4 / 4
-----
?
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Alrighty then, and because all work and no play makes Rich a dull girl, I am off to have some fun myself. WxMan brought home the Wii and is dying for me to try it out. Good Lord.

Anyway, the answer will be found later in the comments. See you then!