THE IRREFUTABLE PROOF: ANGDATINGDAAN IS EVIL

   A   N   G   D   A   T   I   N   G   D   A   A   N
  65  78  71  68  65  84  73  78  71  68  65  65  78     <- ASCII values
   2   6   8   5   2   3   1   6   8   5   2   2   6     <- all digits added
  \_________/ \_________/ \_________/ \_________/ \_/
   7           1           6           9           6     <- final sum

Therefore, "angdatingdaan" actually stands for 71696.

Subtract 2971 - the year the guillotine debuted in France, written backwards. This gives 68725.

Write the number backwards, subtract 1181 - the year of first recorded UFO sightings in China and Japan. The value is now 51605.

Add 7881 to it - the year Erwin Schrodinger, cat-killer, was born, written backwards. The result is 59486.

Write the number backwards, add 1960 - the year first contraceptive pills hit the market. The number is now 70455.

Flip the number backwards, then divide by 11 - the number of spacetime dimensions in string theory. The outcome is 5037.

When you take 1952 - the year the US patent system has been established in its current form - then write it backwards and convert it to octal, you arrive at the very same result.

Proof by the numbers.