When to use on, in, and at when writing English?

[Sonaliinnani]

The rules are simple and one easily get this:

One point in time:

On is used with days:

I will see you on Monday.
The week begins on Sunday.

At is used with noon, night, midnight, and with the time of day:

My plane leaves at noon.
The movie starts at 6 p.m.

In is used with other parts of the day, with months, with years, with seasons:

He likes to read in the afternoon.
The days are long in August.
The book was published in 1999.
The flowers will bloom in spring.

[Mister Micawber]

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Thank you, Sonaliinnani.
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Native English teacher at Mister Micawber's