NET

31 because he has set a day on which he is going to judge the world in righteousness, by a man whom he designated, having provided proof to everyone by raising him from the dead.”

Darby

31 because he has set a day in which he is going to judge the habitable earth in righteousness by [the] man whom he has appointed, giving the proof [of it] to all [in] having raised him from among [the] dead.

KJV

31 Because he hath appointed a day, in the which he will judge the world in righteousness by [that] man whom he hath ordained; [whereof] he hath given assurance unto all [men], in that he hath raised him from the dead.