zaqmlp

@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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