Time

When writing a time that falls on the hour, do not use :00. State the hour with a.m. or p.m.

Wrong: The concert begins at 8:00 p.m.
Wrong: The concert begins at 8 p.m. Friday evening.
Right: The concert begins at 8 p.m.
Right: The concert begins at 8:30 p.m.
Right: The museum is open 10 a.m.-4:30 p.m.

Exception: For proper alignment of a schedule in a list or column, you may use :00 and for times that fall on the hour. If zeros are used, be sure times align vertically in the column (usually flush right).

Use noon and midnight, not 12 a.m. or 12 p.m. Do not use 12 with noon or midnight.

Wrong: The session will end at 12 noon.
More Wrong: The session will end at 12 p.m.
Right: The session will end at noon.
Right: He came to work at midnight.
Wrong:
8 Registration
9:15 Coffee

Right:
8:00 Registration
9:15 Coffee
10:00 Plenary Session
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