@echo off
echo 现在时间是%time:~0,2%点%time:~3,2%分%time:~6,2%秒
set startime=%time:~0,2%%time:~3,2%%time:~6,2%
pause
echo 现在时间是%time:~0,2%点%time:~3,2%分%time:~6,2%秒
set endtime=%time:~0,2%%time:~3,2%%time:~6,2%

set /a finaltime=%startime%-%endtime%
echo 耗时%finaltime%秒
pause