@echo off
call :ctime var "09:58" "11:02"
echo 相差%var%分钟 
pause&exit

:ctime
@echo off&setlocal
for /f "tokens=1-4 delims=:" %%a in ("%~2:%~3") do (
    set /a "var=(1%%c-100)*60+(1%%d-100)-(1%%a-100)*60-(1%%b-100)"
)
endlocal&set %~1=%var%
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