12-hour clock - Wikipedia
https://en.wikipedia.org/wiki/12-hour_clock
webThe 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11.
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