Good and Bad are opposites and are part of Wisdom/Satva and Ignorance/Tamas
Talks with Sri Ramana Mahrshi
If one wants to abide in the thought-free state, a struggle is
inevitable. One must fight one’s way through before regaining one’s
original primal state. If one succeeds in the fight and reaches the
goal, the enemy, namely the thoughts, will ...
Good/Bad means Dharma/Adharma, then yes Dharma does change with time. There is something called Yuga Dharma (duties prescribed for a certain Yuga).
anye kritayuge dharmAs tretAyAm dwApare apare | anye kali-yuge
nrinAm yugahAsAnurupat ||
Manu Smriti 1.85. One set of duties (is prescribed) for men in the
Krita age, different ones in the Treta and ...