@echo off
set "起始时间=08:25:39.80"
set "终止时间=19:51:42.00"

set "mytime=%起始时间%"
call :getTod time_1
set "mytime=%终止时间%"
call :getTod time_2
set "mytime=%time%"
call :getTod time_3
set /a "time_dist1=time_2-time_1"
if %time_dist1% LSS 0 set /a "time_dist1+=8640000"
set /a "time_dist2=time_3-time_1"
if %time_dist2% LSS 0 set /a "time_dist2+=8640000"

if %time_dist2% lss %time_dist1% (
  goto label
) else (
  exit /b
)

:label
echo now is %time%
pause
exit /b

:getTod -- get a Time of Day value in 1/100th seconds
::   -- %~1: out - time of day
SETLOCAL
set t=%mytime: =0%
set /a t=((1%t:~0,2%*60+1%t:~3,2%)*60+1%t:~6,2%)*100+1%t:~9,2%-36610100
( ENDLOCAL & REM RETURN VALUES
    IF "%~1" NEQ "" SET %~1=%t%
)
GOTO:EOF
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@echo off
set t=08:45-20:02

for /f "tokens=1-4 delims=:." %%a in ("%time: =%") do (set h=00%%a&set m=00%%b)
set now=%h:~-2%:%m:~-2%
echo;%now%
for /f "tokens=1* delims=-" %%a in ("%t%") do (set t1=%%a&set t2=%%b)
if "%t1%" lss "%t2%" (
    if "%now%" geq "%t1%" (
        if "%now%" leq "%t2%" (goto run)
    )
)
if "%t1%" gtr "%t2%" (
    if "%now%" geq "00:00" (
        if "%now%" leq "%t2%" (goto run)
    )
   if "%now%" geq "%t1%" (
        if "%now%" leq "23:59" (goto run)
    )
)
goto end
:run
echo;in
:end
>nul ping /n 3 0
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