TechWhirl (TECHWR-L) is a resource for technical writing and technical communications professionals of all experience levels and in all industries to share their experiences and acquire information.
For two decades, technical communicators have turned to TechWhirl to ask and answer questions about the always-changing world of technical communications, such as tools, skills, career paths, methodologies, and emerging industries. The TechWhirl Archives and magazine, created for, by and about technical writers, offer a wealth of knowledge to everyone with an interest in any aspect of technical communications.
Subject:Re: am pm or AM PM From:Barb Miller <millerb -at- TCPLINK -dot- NREL -dot- GOV> Date:Tue, 20 Dec 1994 16:00:44 MST
Timothy Schablin asks . . .
Any suggestions on which way to write am/pm, small case or caps? Does it
make a difference? I've always seen it in lower case.
The Chicago Manual of Style and Words into Type recommend A.M./P.M. as
small caps. Chicago also mentions a.m./p.m. in italics (usually in
Britain), and Words into Type mentions that some publishers use the lower
case version (no italics). (My email spellchecker lists both.) I use
a.m./p.m. (no italics). As long as you are consistent within your document
or company (if this is a company-wide style issue), you're okay in my
book.