From: jj4public@gmail.com   
      
   On Sat, 5 Dec 2020 20:50:10 -0500, Tom Del Rosso wrote:   
   > The last line is the thing I want to point out. It's a single equation   
   > that converts the hour from 24-hour format to 12-hour format. I'm sure   
   > this would run faster than an IF statement and more so if the IF was   
   > followed by a GOTO. In the past I have used IF because I hadn't thought   
   > of doing it all in arithmetic. But I don't see a way to avoid the IF   
   > that chooses am and pm.   
   >   
   > set tm=%time%   
   > set hr=%tm:~0,2%   
   > if %hr% LSS 12 (set AMPM=am) else (set AMPM=pm)   
   > set /a hr=hr%%12 + !hr*12 + !(hr-12)*12   
      
   You can use the ! operator trick like you did for the hour number conversion   
   part, but it'll need more commands which makes it slower than a single IF.   
   e.g.   
      
   @echo off   
   setlocal   
   set tm=%time%   
   set hr=%tm:~0,2%   
      
   set /a hr2=hr%%12 + !hr*12 + !(hr-12)*12   
      
   set /a i=hr/12   
   rem i: 0=am, 1=pm   
   set AMPM=ap   
   call set AMPM=%%AMPM:~%i%,1%%m   
      
   echo %tm% = %hr2%%AMPM%   
      
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