Windows Update Error Date/Time
From KlavoWiki
This only seems to be a problem with Corporate devices using WSUS. If it happens on a non corporate device just ensure the date/time is actually correct.
- Close Windows Update GUI
net stop bits net stop wuauserv net stop cryptsvc
Delete the Windows Registry Folder:
HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate
net start bits net start wuauserv net start cryptsvc
- Open Windows Update GUI and try again.