UPDATE:
Setting up a new Windows system often takes hundreds of custom tweaks.

Given the strategic purpose of Usenet, for some, is to add value,
see also this batch script which randomly randomizes your system TZ.
o https://i.postimg.cc/RVsHGmnG/dsclock.jpg

== cut below for tzrandom.bat ==
@echo off
rem tzrandom.bat randomly sets the Windows system timezone
rem by Herbert Kleebauer, 20200415, alt.msdos.batch
setlocal EnableDelayedExpansion

:loop
set /a n=137*%random%/32768*3+1
for /f "tokens=*" %%i in ('tzutil /l^|more +%n%') do set a=%%i& goto :l1
:l1
echo.
echo.
echo setting time zone to: %a%
tzutil.exe /s "%a%"

:: wait 6-24h
set /a n=20864+(%random%*2)
set /a h=%n%/3600
set /a m=(n-(%h%*3600))/60
echo waiting %h% hours, %m% minutes
timeout %n%
goto :loop

exit 0
== cut above for tzrandom.bat ==

See details in:
o What method do you prefer for scheduling a batch file to run silently
[sans a command window displaying]?
https://groups.google.com/forum/#!searchin/alt.msdos.batch/tzrandom|sort:date/alt.msdos.batch/JZMlGo_2__E/PsN-pab1AwAJ

While we're on the subject, here are scripts that create a Windows XP-style
Cascade menu (of as many as 137 timezone shortcuts) any set of which can
be used to quickly change the System Timezone using the standard
easy-to-use
Windows XP accordion style menus that never left Windows 10
(despite that some, & perhaps even most, people think they did).

o Can a Windows batch script perform the equivalent of a cat until the end
of file delimiter (cat foo eof)?
https://groups.google.com/forum/#!searchin/alt.msdos.batch/tzrandom|sort:date/alt.msdos.batch/0EE2VwfKwYc/fjh7tvLpAAAJ

== cut below for tzmakemenu.bat ==
@echo off
rem tzmakemenu.bat
setlocal enabledelayedexpansion
set t=0
for /f "tokens=*" %%i in ('tzutil /l') do (
set /a t=t+1
set b=!a!
set a=%%i
if !t!==2 (echo REM !b!"!a!.bat"
echo tzutil.exe /s "!a!""!a!.bat"
set t=0))
exit 0
== cut above for tzmakemenu.bat ==

*This manual script randomly executes just _one_ of those 137 files:

== cut below for tzsetmenu.bat ==
@echo off
rem tzsetmenu.bat
setlocal EnableDelayedExpansion
cd .\tzfiles
set n=0
for %%f in (*.*) do (
set /a n+=1
set "file[!n!]=%%f"
)
set /a num=%random% %% 137-1
"!file[%num%]!"
exit 0
== cut above for tzsetmenu.bat ==

For setting up native Windows 10 menus for WinXP-style start menus, see:
o Can windows 10 be made to look like XP?
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/GIEGzBnB1SA/lvxBoSJaBQAJ

o Why does anyone bother to install Classic Shell on Windows?
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/dTHKXIdlqcw/6e7e7dq_AQAJ

o How can we further IMPROVE the efficiency of the Windows left-side
desktop pane?
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/OoKl4lKrFUc/vw8ozQdkAQAJ

o Please follow this cut-and-paste tutorial to get batch command shortcuts
working perfectly on Windows
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/1PzeGP4KMTU/tTbcd9zxAAAJ

o What Windwos freeware adds powerful "phone Susan" & "vipw" commands?
[sic]
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/ySVGbayhLSk/zXK3PjijAwAJ

o Tutorial for setting up a well-organized consistent efficient Windows
menu system
https://groups.google.com/d/msg/microsoft.public.windowsxp.general/eWU-jOkFRtU/lkVU8yolBQAJ
etc.
--
Setting up a new Windows system often takes hundreds of custom tweaks.