Protobuf NaiveDateTime type

Hello,

what would be the best type for proto3 to handle NaiveDateTime from Elixir types.

message PostResponse {
    string content = 1;
    string id = 2;
    google.protobuf.Timestamp inserted_at = 3;
    google.protobuf.Timestamp updated_at = 4;
    string user_id = 5;
}

I think Timestamp is not the best one, I want to have the NativeDateTime type value as it is.
any help would be appreciated.