The main weakness of the 12-hour system is a widespread confusion about which abbreviation should be used for noon and midnight: neither moment can logically be identified as before noon (am) or after noon (pm). What is solar noon? Midnight and Noon: AM or PM? Like many other sources, uses am and pm, but the other variants are equally correct and widely used. post meridiem is usually abbreviated PM, pm, p.m., or P.M. For example, 5 am is early in the morning, and 5 pm is late in the afternoon 1 am is one hour after midnight, while 11 pm is one hour before midnight.Īnte meridiem is commonly denoted as AM, am, a.m., or A.M. Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. The abbreviations am and pm derive from Latin: The second period, marked pm, covers the 12 hours from noon to midnight. The first 12-hour period is designated as am. The 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each. Business Date to Date (exclude holidays).
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