time

Use figures except for noon and midnight. Never write 12 noon or 12 midnight–this is redundant. Only use a colon when separating hours from minutes: 3 p.m., 7:30 a.m. Omit :00 when listing times. Always include a.m. or p.m. with the time. Avoid using o’clock when referring to time.

7 a.m.–4 p.m.; 7–9 p.m.; 7:30 a.m.–9 p.m., 9:20 a.m.–12 p.m. (use an endash between times and not a hyphen)