still confuse over "made" & "madeni"

Dear All

I still confused overまで & までに.

For example,
あの　しごとは　あさっての　よる(までに)　おわらせてください

At the (), I wonder why まで must have に？
I did some question before and I remember sometimes　only まで　is necessary. But I can`t find the example.
Kindly teach me on getting the right concept regarding　までに　and まで.

Thank you

Jason

まで : till, until
７時まで家にいます。
I'll be at home until 7 o'clock.

までに ： by
７時までに家に来てください。
Please come to my home by 7 o'clock.
(i.e. you can come earlier.)

Hi there

Really appreciate your teaching. Sorry for the delay and thank you


Jason