Adding date and time to systems tray in Windows 7
- Right-click an empty space on the taskbar and then click Properties.
- Click the Customize button in the Notification area section of the Taskbar and Start Menu Properties window.
- Click Turn system icons on or off at the bottom left of the Notification Area Icons window.
- Set the Clock icon’s behavior to On and then click OK to save the changes.
Note: Time and Date can only be displayed in the notification area if you're using large Icons for the Taskbar. if you're using small icons, only the time will be shown, for a workaround, see my answer in this thread.
Some alternatives for those who land here:
TClockEx:
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Freeware
ClockDummy:
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Shareware
Sarbyx TrayClock:
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Freeware
Vista Clock:
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Freeware
P.s. Now that we're talking about clocks. I just saw this one.... it's gorgeous, not really what you asked for (not for the system tray):
NOVACLOCK