We use 'at' for specific times on the clock, such as 'at 2.30' or 'at 3 o'clock', as well as for particular points in the day like 'at lunchtime' or 'at breakfast'.
We use 'on' with days of the week (e.g., 'on Monday'), specific dates (e.g., 'on June 20th'), and special days (e.g., 'on Christmas Day').
We use 'in' for parts of the day (e.g., 'in the afternoon'), seasons (e.g., 'in spring'), months (e.g., 'in June'), and years (e.g., 'in 1996').
In British English, 'at the weekend' is commonly used, while some other speakers may use 'on the weekend'. Both are acceptable.
Instead of learning individual words, try learning small chunks of language like time phrases, as they are easier to learn and make English sound more natural.
Learn how to use time expression with the preposition in, on and at.
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