🕑Use 'at' for exact times and general holiday periods.
📍Use 'on' for specific days, dates, and parts of the day.
📌Use 'in' for longer periods such as weeks, months, years, and locations surrounded on all sides.
🏠Use 'at' to refer to a specific position within a building or place.
🌍Use 'in' for cities, countries, and larger areas.