From: klee@unibwm.de   
      
   On 06.12.2020 02:50, Tom Del Rosso wrote:   
      
   > of doing it all in arithmetic. But I don't see a way to avoid the IF   
   > that chooses am and pm.   
   >   
   > if %hr% LSS 12 (set AMPM=am) else (set AMPM=pm)   
      
   I don't think that speed matters in this case or that a solution without   
   an "IF" is faster, but this should do it:   
      
      
   setlocal enabledelayedexpansion   
   set /a n=hr/12*2 & set s=ampm   
   set AMP=!s:~%n%,2!   
      
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