The prepositions 'on' and 'at' have specific uses based on time and specific days or dates.
The preposition 'on' is used to express day, date, and specific days or dates and surfaces, such as 'on October 30th.'
The preposition 'at' is used for expressions of time, like 'at dinner time' or 'at 3 o'clock.'
When considering whether to use 'on' or 'at' in a sentence, remember their specific uses based on time versus specific days or dates.
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