for /F "delims=: tokens=1,2,3" %%A in ("%startTime%") do (
set startH=%%A
set startM=%%B
set startS=%%C
)
if "%startM:~0,1%"=="0" set startM=%startM:~1,1%
if "%startS:~0,1%"=="0" set startS=%startS:~1,1%
set /A totalTime=%endH%*3600+%endM%*60+%endS%-(%startH%*3600+%startM%*60+%startS%)
echo 共用时 %totalTime% 秒。
echo 起始时间：%startH%:%startM%:%startS%>>%mdfive%
echo 结束时间：%endH%:%endM%:%endS%>>%mdfive%
echo 共用时 %totalTime% 秒。>>%mdfive%
start %mdfive%
echo
endlocal
@echo on
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