In, On, At: Prepositions of Time Made Simple

Use	For	Examples
in	longer periods	in 2026, in March, in summer, in the morning, in two weeks
on	days and dates	on Monday, on 14 March, on Australia Day, on my birthday
at	exact times and short moments	at 9 am, at lunchtime, at night, at the moment

Watch out

On the weekend is normal in Australia and the US. British speakers often say at the weekend.
No preposition before this, next, last, every: See you next Friday (not ~~on next Friday~~).
In the morning / afternoon / evening, but at night.

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