Code coach, days between dates, c#

Question

I have problem with hidden test cases:
https://code.sololearn.com/cL4V4WQHPIV1/?ref=app
Code looks like working, similar code in python and Java works OK.
Where is error?

Answer 1

The years of the hidden cases are not older than 1975.

Do all hidden test cases fail?

Does it matter if you write res.Days or res.TotalDays?

Can this be a problem? -> CultureInfo.InvariantCulture

Tbh, I have no idea why your code fails ;)

Answer 2

Only 2 of hidden test cases fail.
Same result with res.Days and res.TotalDays.

Answer 3

try some CultureInfo variants -> same result

Answer 4

This code was successfully compiled with MonoDevelop. I tested it with many input data variants.

Answer 5

Igor Kostrikin

Which 2 testcases? I can try to find them out.

Answer 6

Case #3 and #4