Day of Week Revisited - Wrong Outputs?

Question

I recently found out that the following program returns incorrect outputs for dates with years > 2100 ...

Eg - When I gave input - 01 01 2150, it returned Friday, when it was thursday...

Can anyone help me where does it go wrong?

https://code.sololearn.com/c6fI7d6YO5rQ/?ref=app

Thanks to this error, I lost a challenge in CodeChef...

Please help!

Answer 1

Did you see the code posted by @David?

Would this method work for you?

https://www.sololearn.com/discuss/411673/?ref=app

Answer 2

@jay
Yes, I think ill have to switch to that...

Answer 3

@jay
But what about my algorithm, why isn't that working?

Answer 4

@JPM7
Sir, the formula for date to day you have used is entirely different from what I tried to implement...

You have used a formula, I tried counting days literally to get the date...

Perhaps this is the reason my hit and trial formula doesn't prove to be successful - I simply did not complete my research on this...

Just read about odd-day calculation back then and tried implementing, and by chance it worked for years less than 2100...

Ill retry with a better approach like this one...

Thank You, Sir!