apa perbedaan fungsi on,in , at

In digunakan untuk menunjukkan nama tempat yang sudah umum.
On digunakan untuk menulis nama hari, dan alamat tempat.
At digunakan untuk menulis alamat secara lengkap, dan waktu (jam).
Semoga membantu.

preposition of time
on (with time and date)
ex : she was born on 8 of september 1990
       the appointment is on monday
at (with noon, night, midninght; with the time of day)
ex : we can see the moon at night
       the lesson will start at 11.30
in ( with other part of the day, with months, years, with season, time of day preceded)
ex : the second world war was ended in 1945

preposition of place
on ( diatas sesuatu hal, yang permukaannya bersentuhan)
ex : the book is on the table
in (didalam sesuatu hal)
ex :the bag is in the shelf
at (dalam skala besar)
ex : he is at the mall