[[Magic Reveal: Calculate Birth Date.jpg]]#
- Birth month x4
- +13
- x25
- -200
- +Birth date's day
- x2
- -40
- x50
- +Last two digits of birth year
- -10500
- The first one or two digits of the result are the month, the next two digits are the day, and the last two digits are the year
- Principle:
- Let a represent the month, b represent the day, c represent the last two digits of the year
- {[(4a+13)x25-200+b]x2-40}x50+c-10500