To remove the clock from the system tray on the taskbar open the registry and Navigate
to either
[HKEY_CURRENT_USER\SoftwareMicrosoft\Windows\CurrentVersionPolicies\Explorer]
or
[HKEY_LOCAL_MACHINE\SoftwareMicrosoft\Windows\CurrentVersionPolicies\Explorer]
and then either modify or create a new DWORD value named HideClock and set the value data to 1. Now exit the registry, and restart your computer for the change to take effect.
