# Re: Notation of time (a.m., p.m.)

• Subject: Re: [amsat-bb] Notation of time (a.m., p.m.)
• From: "Scott Migaldi" <smigaldi@xxxxxxxxxxx>
• Date: Mon, 17 Jun 2002 13:32:29 +0000

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>------------------------------
>
>Date: Mon, 17 Jun 2002 07:12:10 +0200
>From: Udo Schneider <uschndr@zedat.fu-berlin.de>
>Subject: [amsat-bb] Notation of time (a.m., p.m.)
>
>Hello friends,
>
>I'm totally confused about the official notation of time
>in the USA around noon.
>
>Could somebody correct the following table?
>
>24 h notation   12 h notation
>=============================
>  0:00     =      0:00 a.m.
>  1:00     =      1:00 a.m.
>11:30     =     11:30 a.m.
>12:00     =     12:00 a.m. or 12:00 p.m. or  0:00 a.m. or 0:00 p.m. ???
>12:30     =     12:30 p.m. or  0:30 p.m. ???
>13:00     =      1:00 p.m.
>23:30     =     11:30 p.m.
>
>Tnx es 73, Udo, DL7OL ***
>
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>

In reallity there is no 12am or 12 pm the 12 noon  (1200 hours) and 12
midnight (0000 or 2400 hours). There are many people who attempt to use pm
or am for noon and midnight but there is no official convention. When I see
it in a message I try to put apply commonsense, if I get a message that say
we are having a department meeting at 12am I assume noon and not midnight,
etc.

SO outside of those two examples am applies to the hours of one minute past
midnight to 1159 and pm applies to one minute after noon to 2359.

>  0:00     =      midnight
>  1:00     =      1:00 a.m.
>11:30     =     11:30 a.m.
>12:00     =     noon
>12:30     =     12:30 p.m. 13:00     =      1:00 p.m.
>23:30     =     11:30 p.m.

Hope that helps.

And please do get me started on date conventions in the US.

Scott

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