Time
When the word o'clock is used, spell out the number which indicates the hour.
The meeting is at eight o'clock.
She left at five o'clock.
Dinner will be served at seven-thirty o'clock. (Formal)
The plane will leave at 6:30 o'clock.
(Figures may be used in business writing to indicate hours and minutes followed by the word o'clock.)
Figures are used customarily with A.M. and P.M. Moreover, the trend is to express these abbreviations in small letters ( a.m. ) rather than capitals ( A.M. )
The store is opened from 5:30 a.m. to 8:30 p.m.
The plane arrives at 12 m.
(The abbreviation m., for meridies, is used to indicate noon. The abbreviation n. also is used to indicate noon.)
As you have already learned, use the colon between hours and minutes when expressed in figures.
The mall will open at 10:00 a.m. and close at 9:30 p.m.
(Not: . . . at 10 a.m. and close at 9:30 p.m.)
Correct: The mall opens from 10 a.m. to 9 p.m.
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