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Follow this format when writing the time for events:

7 to 9 a.m.
7:30 a.m. to 9 p.m.
9 a.m. to noon
10 p.m. to midnight
12 a.m. should always be written as midnight.
12 p.m. should always be written as noon.

Note: a.m. and p.m. are always separated by periods. Events starting on the hour do not use minutes (:00).

For example: 9 a.m., not 9:00 a.m.

Use the term working hours rather than business hours when describing hours of operation.