Remove Clock from the system notification area: registry value HideClockUserHKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer

Policy ID
NoTaskBarClock
Scope
User Configuration
Supported on
At least Windows Server 2003 operating systems or Windows XP Professional
Source
Administrative Templates (.admx) for Windows 11 2026 Update (26H2) (version 1.0)
Category
Start Menu and Taskbar

Registry

HideClock

-User