Comparing registry string value within a date range - date

Question

I am writing a batch script which needs to compare registry data value string with ±3 days of todays date.
My REG QUERY returns a value:
HKEY_LOCAL_MACHINE\Software\Wow6432Node\KasperskyLab\Components\34\1103\1.0.0.0\Statistics\AVState
Protection_BasesDate REG_SZ 27-08-2018 08-53-00
I need to output to a file, depending if it is within the range or not.
Script:
REG QUERY "HKLM\Software\Wow6432Node\KasperskyLab\Components\34\1103\1.0.0.0\Statistics\AVState" /v "Protection_BasesDate" | Find "2018"
IF %ERRORLEVEL% == 1 goto end
If %ERRORLEVEL% == 0 goto makefile
:makefile
echo "{"product":"Override Antivirus","running":true,"upToDate":true}" > c:\ProgramData\CentraStage\AEMAgent\antivirus.json
:end
#exit

Answer 1

This solution takes this answer as base, so please review such an answer before post further questions here...
#echo off
setlocal EnableDelayedExpansion
rem Define the "Date to Julian Day Number" conversion function
set "DateToJDN(YMD)=( a=(YMD), y=a/10000, a%%=10000, m=a/100, d=a%%100, a=(m-14)/12, (1461*(y+4800+a))/4+(367*(m-2-12*a))/12-(3*((y+4900+a)/100))/4+d-32075 )"
rem Get the JDN of today's date minus/plus 3
for /F "tokens=2 delims==" %%t in ('wmic os get localdatetime /value') do set "dateTime=%%t"
set /A "todayMinus3=!DateToJDN(YMD):YMD=%dateTime:~0,8%!-3, todayPlus3=todayMinus3+6"
reg Get the date from REG QUERY command; the assumed output format is: Protection_BasesDate REG_SZ 27-08-2018 08-53-00
for /F "tokens=3-5 delims=- " %%a in (
'REG QUERY "HKLM\Software\Wow6432Node\KasperskyLab\Components\34\1103\1.0.0.0\Statistics\AVState" /v "Protection_BasesDate"'
) do set /A "BasesDate=!DateToJDN(YMD):YMD=%%c%%b%%a!"
if %BasesDate% geq %todayMinus3% if %basesDate% leq %todayPlus3% (
echo Date in range
)

Answer 2

There are many languages that can do much better than batch, but this might be a solution.
#echo off
set day=-3
for /f "delims=" %%i in ('reg query "HKLM\Software\Wow6432Node\KasperskyLab\Components\34\1103\1.0.0.0\Statistics\AVState" /v Protection_BasesDate" ^| findstr "2018"') do set "regdate=%%i"
for /f "tokens=1-3" %%a in ("%regdate%") do set "actual=%%c"
:check
echo >"%temp%\%~n0.vbs" s=DateAdd("d",%day%,now) : d=weekday(s)
echo>>"%temp%\%~n0.vbs" WScript.Echo year(s)^& right(100+month(s),2)^& right(100+day(s),2)
for /f %%a in ('cscript /nologo "%temp%\%~n0.vbs"') do set "result=%%a"
del "%temp%\%~n0.vbs"
set "yyyy=%result:~0,4%"
set "mm=%result:~4,2%"
set "dd=%result:~6,2%"
set "final=%dd%-%mm%-%yyyy%"
echo %final%
if %day% == 1 goto :EOF
if %actual% == %final% (echo Within 3 days!!) else (set /a day+=1 & goto :check)
We actually get the date of the system using cscript (yes I pipe to file, but you can run hybrid without the temp file) Then we take the past 3 days' dates and match them in the format of the registry key, if the key matches within 3 days, I just echo Within 3 days! There is also an if statement, if the day counter = 1, I exit the script, as we do not want to go into future and this loop forever if the counter if we do not stop it somewhere.
If it does work for you, you can simply remove the line print %final% and replace this line:
if %actual% == %final% (echo Within 3 days!!) else (set /a day+=1 & goto :check)
with this line:
if %actual% == %final% (echo "{"product":"Override Antivirus","running":true,"upToDate":true}" > "c:\ProgramData\CentraStage\AEMAgent\antivirus.json") else (set /a day+=1 & goto :check)