Are both phrases are correct? Doesn't or not.
- It's important doesn't to arrive late.
- It's important not to arrive late.
Doesn't is a contraction for does not. Don't arrive late. He doesn't arrive late. It is important NOT to arrive late.
But in English this would be turned around the other.
It is important TO ARRIVE on time. Or, to not be late. A person is late, not does late.