@echo off
setlocal enableDelayedExpansion
set time1=2012-06-21 20:00:00
set time2=2012-06-22 08:30:00
call :z1 !time1:~-8,2!&set a=!aa!
call :z1 !time2:~-8,2!&set b=!aa!
set /a c1=!b!-!a!
if not !c1!==0 call :z1 !c1!&set c1=!aa!
call :z1 !time1:~-5,2!&set a=!aa!
call :z1 !time2:~-5,2!&set b=!aa!
set /a c2=!b!-!a!
if not !c2!==0 call :z1 !c2!&set c2=!aa!
call :z1 !time1:~-2,2!&set a=!aa!
call :z1 !time2:~-2,2!&set b=!aa!
set /a c3=!b!-!a!
if not !c3!==0 call :z1 !c3!&set c3=!aa!
call :z1 !time1:~-11,2!&set a=!aa!
call :z1 !time2:~-11,2!&set b=!aa!
set /a c4=!b!-!a!
if not !c4!==0 call :z1 !c4!&set c4=!aa!
if !c4! geq 1 (
	if !c1!==0 (
		set c4=!c4!
	) else (
		set /a c4=!c4!-1
	)
)
echo 时间差“!c4!天 !c1!小时!c2!分钟!c3!秒”
pause&exit
:z1
set aa=%1
set "aa=!aa:-=!"
if "!aa:~0,1!"=="0" set "aa=!aa:~1!"
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