Use the 12-hour clock rather than the 24-hour clock. Write a.m. and p.m. with points and insert a non-breaking space between the time and the abbreviation. Use a point to separate hours from minutes.

Small_OK The lecture starts at 9.30 a.m.
Small_OK The library closes at 7.30 p.m.

Spell out the number with the term o’clock, which is used to designate exact hours only.

Small_OK The rector’s speech will begin at four o’clock.

Use the terms noon (or 12 noon) and midnight, rather than 12 p.m. and 12 a.m.

Small_OK The tutorial, which was due to begin at noon, began at 1.15 p.m.
Small_OK The campus copy shop closes at 12 noon.
Small_OK The faculty bar will serve coffee until midnight.

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