We use:

• at for a PRECISE TIME
• in for MONTHS, YEARS, CENTURIES and LONG PERIODS
• on for DAYS

Here are some example as for the usage of “AT”

* we use ‘at’ with an indicated timeframe

 ‘AT’- to indicate a place, to refer an email address, to refer a time , indicate one’s activity

• I have a meeting at 9am.
• The shop closes at midnight.
• Jane went home at lunchtime.
• My interview is at 3.00pm.
• She often goes for a walk at night.
• They go to bed at midnight.
•  I reached Georgetown at 9 morning.

be sure to check my other available posts ;)...Waiting yeaaa

‘IN’ – to indicate a location, specify day/months

• In England, it often snows in December.
• Do you think we will go to Jupiter in the future?
• There should be a lot of progress in the next century.
• I am in my friend’s place now.
• The tagline should be catchy in marketing a product.
• The new academic session will commence in March.
• This dress comes in four sizes.

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‘ON’- to indicate a state, parts of the body, specifies days and dates, 

• Do you work on Mondays?
• Her birthday is on 20 November.
• Where will you be on New Year’s Day?
• She is on the phone
• I keep wearing my wedding ring on my finger.
• The products available in the store are on sale.
• I will come on Wednesday.
• My birthday is on 25th of Jan 2023.