Look at these time expressions. It is important to use the right preposition when using time expressions.

at + the exact time
I usually wake up at half past six.

in + a period of time
She started working in the morning and left late in the evening.

on + a day I was born on 13th June 1968
He had an amazing party on his birthday.

for + a length of time
I waited for Sarah for two hours.

since + a point in time
I’ve been here since eleven o’clock.

There is no preposition before last, next, this/that day, every, all, whole, yesterday, tomorrow, today.
He arrived from France last night
I have a meeting with him next Monday