setlocal enabledelayedexpansion 
set "fn=D:\a.htm" 
for %%a in ("%fn%") do ( 
  if exist "%fn%" ( 
    for /f "tokens=1-10 delims=/-: " %%i in ("%%~ta !date:~,10! !time:~,5!") do ( 
      set/a y1=%%i,m1=1%%j%%100,d1=1%%k%%100,h1=1%%l%%100,f1=1%%m%%100,y2=%%n,m2=1%%o%%100,d2=1%%p%%100,h2=1%%q%%100,f2=1%%r%%100 
      set /a "f=(1461*(y2+(m2-14)/12)/4+367*(m2-2-(m2-14)/12*12)/12-3*((y2+(m2-14)/12)/100+1)/4-1461*(y1+(m1-14)/12)/4-367*(m1-2-(m1-14)/12*12)/12+3*((y1+(m1-14)/12)/100+1)/4-d1+d2)*1440+(h2-h1)*60+f2-f1" 
      if !f! geq 180 ( 
       echo 当前时间:【!date:~,10! !time:~,5!】距文件修改时间:【%%~ta】已超过设定值[分钟]
start A...
      ) else (
echo 没有超过设定值! 
goto uu) 
    ) 
  ) 
)
pause&exit
:uu
start B...
pause&exit
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