Stop the time service then change the clock from elevated command
net stop w32time
date 4/22/2021
net start w32time
date 4/22/2021
net start w32time
NOTE: the clock does switch back periodically, to permanently disable the clock changes use
W32TM /unregister
date 4/22/2021
W32TM /register
W32TM /resync
date 4/22/2021
W32TM /register
W32TM /resync
This removes the Windows Time NT service, side effects could occur if the NT service isnt added back to the OS