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Use figures for all times, including 12:00 noon and 12:00 midnight. A colon separates hours from minutes: 11:00 a.m., 1:15 p.m., 3:45 p.m.

Use a space between 11:00 and a.m., and always use periods for a.m. and p.m. Never use phrases such as 10:00 a.m. this morning, 10:00 p.m. tonight; they are redundant.

Repeat a.m. and p.m. when a span is given, and separate using an en dash with no spaces: 6:30 a.m.–10:00 a.m.

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