Take the date you were born on.
Multiply it by 4.
Add 13.
Multiply by 25.
Subtract 200.
Add the month you were born.
Multiply by 2.
Subtract 40.
Multiply by 50.
Add the last two digits of the year you were born.
Subtract 10500.

Notice something familiar about the result?

Any thoughts on how this was formulated?