British English usage: Use at for precise times, on for days/dates, and in for months, years and longer periods. For place, at often marks a point, on a surface, and in an enclosed or larger area.

Cambridge Grammar reference: Cambridge grammar treats prepositions as strongly context-dependent, so HiLernity tests common A1 patterns rather than pretending every use follows one mechanical rule.

Source note: HiLernity is independent and is not affiliated with or endorsed by the British Council or Cambridge University Press & Assessment.