one shellscript problem

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Ubuntu

hi,

i am new for unix. i am using ubuntu.
plz help me to solve the shellscript

i want to run a shellscript which work on calender

problem:

i want to replace the current date with * or ** depending on below condition:
1) if today's date have single digit then it must be replace by *.
2) if today's date have two digit then it must be rplace by **.
3) if suppose todays data is 10th then in year 2010 10 must not replace by **.

thanks in advance...