DosTips.com

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@ECHO off

Call:Timer 10 30
Echo(done
Goto:Eof


:Timer minutes seconds
cls
setlocal
2> nul Set /A "m=%~1" || Exit /b 1
2> nul Set /A "s=%~2"
Set not0=2^>nul Set /A 1/
If not defined s Set s=0
:tloop
 If %s% LSS 10 (Set os=0)Else set "os="
 If %m% LSS 10 (Set om=0)Else set "om="
 Echo(%om%%m%:%os%%s%
 %not0% s && ( Set/A s-=1 ) || ( %not0% m && ( Set/A m-=1,s=59 ) || ( Endlocal & Exit/b ) )
Timeout /t 1 /NoBreak > nul 2>&1 || (
 start "" /w /b /min mshta "javascript:setTimeout(function(){close();},1000);"
)
cls
Goto:tloop

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start "" /w /b /min mshta "javascript:setTimeout(function(){close();},1000);"

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@echo off
setlocal

rem Get end time
REM for /F "tokens=1,2 delims=:" %%a in ("ResponseTime.txt") do set /A endH=10%%a%%100, endM=1%%b%%100

REM Just for testing:
set endH=14
set endM=58

title Timer
mode con cols=16 lines=2

:synchronize
for /F "tokens=1,2 delims=:" %%a in ("%time%") do set /A "minutes=(endH*60+endM)-(%%a*60+1%%b-100)-1, seconds=159"

:wait
timeout /T 1 /NOBREAK > NUL
echo Timer:  %minutes%:%seconds:~-2%
set /A seconds-=1
if %seconds% geq 100 goto wait
set /A minutes-=1, seconds=159, minMOD5=minutes %% 5
if %minutes% lss 0 goto :buzz
if %minMOD5% equ 0 goto synchronize
goto wait

:buzz
pause