@echo off
set t1=%time:~0,8%
set t2=%time:~0,8%
set s1=1%t1:~6,2%
set /a s1=s1%%100
set s2=1%t2:~6,2%
set /a s2=s2%%100
set m1=1%t1:~3,2%
set /a m1=m1%%100
set m2=1%t2:~3,2%
set /a m2=m2%%100
set h1=1%t1:~0,2%
set /a h1=h1%%100
set h2=1%t2:~0,2%
set /a h2=h2%%100
if %s2% lss %s1% set /a s2+=60&set /a  m2-=1
if %m2% lss %m1% set /a m2+=60&set /a h2-=1
set /a s3=s2-s1
set /a m3=m2-m1
set /a h3=h2-h1
echo 共用时%h3%小时%m3%分钟%s3%秒
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