Hello and welcome to the forum MarshCaptain
(1)Right click on your taskbar.
(2)Click on Properties
(3)Go to Taskbar and start menu properties
(4)See on Notification Area
(5)You will get the box where all your icons are shown.
(6)Click on Turn system icons on or off.
(7)Select Clock and make sure it's set to ON
A tutorial System Icons - Turn On or Off
Hope that helps.