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How to Write Times (a.m. and p.m.) in a Manuscript?


When writing times using abbreviations in a book manuscript, use a.m. for mornings and p.m. for any times after noon. Be sure to leave a space before the abbreviations.


Mary set her alarm for 8 a.m.

On September 11, 2001 at 8:46 a.m., hijackers crashed American Airlines Flight 11 into the North Tower of the World Trade Center.

The couple married on Saturday, July 15 at 2:45 p.m.

This is what the Chicago Manual of Style (the style guide most used by publishers) recommends, so you can’t go wrong.

Note: It is also acceptable to write these abbreviations in small capital letters without periods. But using small caps in a manuscript is complex and generally considered a no-no. So stick with using lower case letters with periods, and life will be good.

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