made ni までに

Particle meaning: by (the time when...), before

1. After noun expressing time (limit)
今週の終わりまでにこの仕事を終えなければなりません。
Konshuu no owari made ni kono shigoto o oenakereba narimasen.
I have to finish this work by the end of this week.

2. After dictionary form of verb
彼女が来るまでに用意しておきましょう。
Kanojo ga kuru made ni youi shite okimashou.
Let's be prepared by the time she comes.
-> See also: made, mae