Calendar Puzzle
What numbers should you put on the sides of two cubes, so that every date of the month can be expressed using these cubes?

SOLUTION
You put the numbers 0, 1, 2, 3, 4, 5 on the first die and the numbers 0, 1, 2, 7, 8, 6/9 on the second die.
We do not know where this puzzle originated from. If you have any information, please let us know via email.