Clock Time System Twelve-Hour Clock Time System https://en.wikipedia.org/w/index.php?title=12-hour_clock&oldid=1057602523 https://www.commoncoreontologies.org/InformationEntityOntology 12-Hour Clock 12-Hour Clock Time System A Clock Time System for keeping the Time of Day in which the Day runs from midnight to midnight and is divided into two intervals of 12 Hours each, where: the first interval begins at midnight, ends at noon, and is indicated by the suffix 'a.m.'; the second interval begins at noon, ends at midnight, and is indicated by the suffix 'p.m.'; and the midnight and noon Hours are numbered 12 with subsequent Hours numbered 1-11. Twelve Hour Clock Twelve Hour Clock Time System Twelve-Hour Clock