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What Do AM and PM Stand For?

Rickey Stokes

Viewed: 3089

Posted by: RStokes
rstokes1450@gmail.com
334-790-1729
Date: Aug 19 2019 6:43 PM

Some countries, including the US, Canada, and Australia, use the 12-hour clock format including am and pm. What do these abbreviations mean? Is midnight am or pm?


Two 12-Hour Periods


The 12-hour system divides the 24 hours of a day into two periods lasting 12 hours each. The first 12-hour period is designated as am. It runs from midnight to noon. The second period, marked pm, covers the 12 hours from noon to midnight.


The abbreviations am and pm derive from Latin:



  • AM = Ante meridiem: Before noon

  • PM = Post meridiem: After noon


Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day. 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.


Ante meridiem is commonly denoted as AM, am, a.m., or A.M.; post meridiem is usually abbreviated PM, pm, p.m., or P.M. Like many other sources, timeanddate.com uses am and pm, but the other variants are equally correct and widely used.


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