Days of the week take 'on'. Months and years take 'in'. Specific times take 'at'. This is one of the most common non-native slips and one of the easiest to self-correct once you know the rule. Quick heuristic: bigger bucket → larger preposition (at 3pm → on Monday → in May → in 2026).
BeforeThe review is in Friday at afternoon.
AfterThe review is on Friday in the afternoon.
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