A backward clock code was needed, please

Answer 1

Make it up when I can't. This time is set and then he walks back.

Answer 2

Hi! First of all you can try to do it yourself. And then you can show us your effort here.

Answer 3

Please, at least specify a relevant language name in tags above rather than 'please'.

And what you mean by backward clock code? I think you need to be more descriptive with the question.