[🏆 CHALLENGE 🏆]: Re-Use old Calenders :-)

Question

I have a some-how practical question.
Next year 2018 I want to re-use an old calender from ...
Which calender should I use such that all week-days are correct?

Answer 1

Here is my solution in python:
https://code.sololearn.com/c0PCmwTb8NRg/#py

Answer 2

fine, but it is a game about coding, isn't it?
I mean, it's about the code, that find the corresponding year for arbitrary inputs.

Answer 3

https://code.sololearn.com/czIAeW1LrU7B/?ref=app

Answer 4

2007

Answer 5

My PHP solution with mktime and date.
https://code.sololearn.com/wFTXK09x15hF