So, to be clear, Google is lamer than DDG because it supports the natural language expression `X days after M D Y` but does not support the mathematical `M D Y + X days`

I guess Google has figured out with its trillions(?) of queries how humans search and not how nerds search.

Why not be more inclusive and enable both how humans search as well as how nerds search?

Interestingly it seems that DDG also supports "human" search: https://duckduckgo.com/?q=500+days+after+march+12+2019&t=can...

(Also interesting that you can infer that I'm on Ubuntu from my sharing of the search URL, though.)

Sure, nothing stopping them, and I'm not arguing against that.

every nerd is a human