The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from the Latin ante meridiem, meaning "before midday") and p.m. (post meridiem, "after midday"). Each period consists of 12 hours numbered: 12 (acting as zero), 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11.
The 12-hour clock was developed over time from the mid-second millennium BC to the 16th century AD.
Read more about 12-hour Clock: History and Use, Abbreviations, Confusion At Noon and Midnight
Famous quotes containing the word clock:
““Pop” Wyman ruled here with a firm but gentle hand; no drunken man was ever served at the bar; no married man was allowed to play at the tables; across the face of the large clock was written “Please Don’t Swear,” and over the orchestra appeared the gentle admonition, “Don’t Shoot the Pianist—He’s Doing His Damndest.””
—Administration in the State of Colo, U.S. public relief program. Colorado: A Guide to the Highest State (The WPA Guide to Colorado)