Home / course review / pm&r board review course Pm&r board review course 12/08/2021 Some countries, including the US, Canada, and also Australia, use the 12-hour clock format including am and pm. What execute these abbreviations mean? Is midnight am or pm?12-hour clock at noon: 12 am or 12 pm?Two 12-Hour PeriodsThe 12-hour device divides the 24 hours of a day into 2 durations lasting 12 hours each. The first 12-hour duration is designated as am. It runs from midnight to noon. The second duration, marked pm, covers the 12 hrs from noon to midnight.You watching: Pm&r board review courseThe abbreviations am and also pm derive from Latin:AM = Ante meridiem: Before noonPM = Post meridiem: After noonUsing numbers from 1 to 12, followed by am or pm, the 12-hour clock mechanism identifies all 24 hrs of the day. For instance, 5am is beforehand in the morning, and 5pm is late in the afternoon; 1am is one hour after midnight, while 11pm is one hour prior to midnight.Ante meridiem is frequently dedetailed as AM, am, a.m., or A.M.; write-up meridiem is normally abbreviated PM, pm, p.m., or P.M. Like many kind of various other sources, sibbap.org supplies am and pm, however the other variants are equally correct and widely used.What is solar noon?Midnight and also Noon: AM or PM?The main weakness of the 12-hour mechanism is a widespcheck out confusion around which abbreviation should be provided for noon and also midnight: neither moment can logically be identified as before noon (am) or after noon (pm). For instance, the minute of midnight occurs precisely 12 hrs after noon on the previous day and also 12 hrs prior to noon on the adhering to day.However before, many digital clocks and most sources, consisting of sibbap.org, designate midnight as 12am and noon as 12pm. Although the specific moment of noon falls in neither category, the hour doing well it, from 12:00:01 to 12:59:59, is plainly after noon.To stop any type of confusion as soon as referring to the precise moment of noon or midnight, we recommend making use of the desigcountries 12noon and 12midnight instead.See more: Book Summary And Reviews Of Blame Book Review S Of Blame By Michelle HunevenMidnight ConfusionAnother resource of confusion is the absence of a day designator in the 12-hour device, making it difficult to logically determine a correct moment in time when only a day and 12:00am (midnight) is provided.Imagine being asked to pick up a friend at the airport at 12:00am on April 13. Would you go tright here at midnight in between April 12 and April 13? Or 24 hours later?One way to get rid of this trouble is to sacrifice accuracy for clarity. Your frifinish might ask you to be at the airport at 12:01am on April 13 or, if the adhering to midnight is supposed, at 11:59pm on April 13. Conversely, the 24-hour format can be supplied. Here, 0:00 describes midnight at the beginning of the day while 24:00 is midnight at the finish of the day.Time Formats12-hour24-hour12:00 (midnight)0:00 (beginning of the day)12:01 am0:011:00 am1:002:00 am2:003:00 am3:004:00 am4:005:00 am5:006:00 am6:007:00 am7:008:00 am8:009:00 am9:0010:00 am10:0011:00 am11:0012:00 (noon)12:0012:01 pm12:011:00 pm13:002:00 pm14:003:00 pm15:004:00 pm16:005:00 pm17:006:00 pm18:007:00 pm19:008:00 pm20:009:00 pm21:0010:00 pm22:0011:00 pm23:0012:00 (midnight)24:00 (finish of the day)Converting 12-Hour to 24-Hour FormatA 24-hour clock, periodically referred to as military time, says the moment according to the variety of hours that have actually passed considering that midnight. Starting at midnight, hours are numbered from 0 to 24, removing the need for designations prefer am and also pm. For instance, at 23:00, 23 hrs have passed considering that the start of the current day.To transform am or pm time to the 24-hour format, use these rules:From midnight to 12:59am, subtract 12 hrs.12:49am = 0:49 (12:49 – 12)From 1am to noon, perform nopoint.11:49am = 11:49From 12:01pm to 12:59pm, carry out nopoint.12:49pm = 12:49From 1:00pm to midnight, add 12 hours.1:49pm = 13:49 (1:49 + 12) Here"s just how to convert time on a 24-hour clock to the 12-hour system:From 0:00 (midnight) to 0:59, include 12 hours and also usage am.0:49 = 12:49am (0:49 + 12)From 1:00 to 11:59, simply include am after the moment.11:49 = 11:49amFrom 12:00 to 12:59, just add pm after the moment.12:49 = 12:49pmFrom 13:00 to 0:00, subtract 12 hrs and use pm.13:49 = 1:49pm (13:49 - 12)Wbelow Is the 12-Hour Style Used?Many countries about the human being now use the 24-hour mechanism. However, the 12-hour format, consisting of am and also pm, is officially offered in a variety of nations, including the USA, Canada (other than Québec), Australia, New Zealand also, and also the Philippines.Why Does the Day Have 24 Hours?The Egyptians are thshould be responsible for splitting the day into 24 equal parts. One account says that this practice progressed bereason the Egyptians typically supplied the base 12, counting the 3 joints in their fingers, not consisting of the thumb.