AM/PM (or "12 Hour Clock"): ns day is split into: the 12 hours to run native Midnighns to No~ above (ns AM hours), and the other 12 hrs to run indigenous Noon to Midnighns (ns PM hours).


*Is the spelled "Meridiem" or "Meridian"? view here.

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converting AM/pm come 24 Hours Clock

include 12 come any kind of hour after Noon (and subtract 12 for ns initially hours that the day):

for the initially hour the the work (12 Midnight come 12:59 AM), subtract 12 Hours


converting 24 Hour Clock come AM/PM

because that the first hour that the work (00:00 to 00:59), include 12 Hours, make ins "AM"


to be / PM 00:00 12 Midnight 00:10 12:10 AM 01:00 1:00 AM 01:10 1:10 AM 02:00 2:00 AM 02:10 2:10 AM 03:00 3:00 AM 03:10 3:10 AM 04:00 4:00 AM 04:10 4:10 AM 05:00 5:00 AM 05:10 5:10 AM 06:00 6:00 AM 06:10 6:10 AM 07:00 7:00 AM 07:10 7:10 AM 08:00 8:00 AM 08:10 8:10 AM 09:00 9:00 AM 09:10 9:10 AM 10:00 10:00 AM 10:10 10:10 AM 11:00 11:00 AM 11:10 11:10 AM 12:00 12 Noon 12:10 12:10 PM 13:00 1:00 PM 13:10 1:10 PM 14:00 2:00 PM 14:10 2:10 PM 15:00 3:00 PM 15:10 3:10 PM 16:00 4:00 PM 16:10 4:10 PM 17:00 5:00 PM 17:10 5:10 PM 18:00 6:00 PM 18:10 6:10 PM 19:00 7:00 PM 19:10 7:10 PM 20:00 8:00 PM 20:10 8:10 PM 21:00 9:00 PM 21:10 9:10 PM 22:00 10:00 PM 22:10 10:10 PM 23:00 11:00 PM 23:10 11:10 PM

Midnighns and also Noon

"12 AM" and also "12 PM" deserve to reason confusion, therefore we prefer "12 Midnight" and "12 Noon".

Wcap day ins Midnight?

Midnight has actually one more problem: tbelow ins nothing to tell us "is thins ns beginning or finishing the ns day".


*

Imagine her friend say castle to be leavinns for holiday at "midnight" top top 12th March, what work should you arri have come say goodbye?

execute you acquire tbelow top top ns 11th (assuminns castle leave at the exceptionally begin the the 12th), or ns 12th (assuminns castle leave in ~ the end the ns 12th)?


It ins much better to use:

11:59 pm or 12:01 AM, or 23:59 or 00:01 (24-Hour Clock)

i m sorry the railroads, airline and army in reality do.

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So, when you check out somepoint prefer "offer end midnight October 15th" teltogether them to usage a minute prior to or after so tbelow ins no confusion!


FootKeep in mind ~ above "Meridiem" vns "Meridian"

need to "AM" it is in "ante meridiem" or "ante meridian" (additionally for PM)?

the main (follow to one American, Australione and brother dictionary), and Many common, spelling for am is "ante meridiem" which ins a Latin phrase. Ns recommfinish that spelling!

but world sometimes usage the phrase "ante meridian" (a "meridian" in this situation describes an imagine line in ns skies when the sunlight ins in ~ itns highest possible point).


including and Subtracting Tins Clocks - Digitatogether and Analog sunlight Clock civilization Time zones Earth"s Orbit and Daylight