YOU SAID:

I wish it need not have happened in my time

INTO JAPANESE

私の時代にはそんなことが起きなければよかったのに

BACK INTO ENGLISH

I wish that hadn't happened in my time.

INTO JAPANESE

私の時代にそんなことが起こらなかったらよかったのに。

BACK INTO ENGLISH

I wish that hadn't happened in my time.