The output years don´t match the input years, so why not?

I followed the instructions, but got a strange result.

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This happened because you inserted an integer into the last field instead of a date string, you have to insert it with the single quotes:
Correct way:
Wrong way:

The birthday values you inserted are as follows:

1990 - 05 - 30 = 1955;

because 1990 - 5 = 1985, and 1985 - 30 = 1955.