Your birthdate (1)

I have already guessed your age in two previous tricks.
This time I'm going to guess your birthdate.
You will have to calculate the following so as to give me a clue.
Multiply the day when you were born by 12.
Then multiply the month by 31.

Finally add both totals,
 enter your result
 then click on OK.

An example ? Click here .

Enter your result  

 

You were born
on
  

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(1) In Oh, les Maths ! by Yakov Perelman, éditions Dunod