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If you want to display a clean Windows 7 taskbar, you must hide the system tray and clock that appears on the right side of the Windows taskbar.
To hide the notification area or taskbar that appears on the right side of your Windows taskbar, type gpedit.msc in the search box and press Enter to open the group policy editor.
Go to User Configuration > Administrative Templates > Start Menu and Taskbar.
Double-click the Hide Notification Area entry, select the’On’ button, click Apply > OK.
You can also try this free SysTray Hider software.
Hide clock under Windows 7
To Hide the system clock double-click the Remove clock from the system notification area entry. Select the Enabled button and click Apply > OK.
To return to the default settings, you must turn them off or not configure them.
You can also hide the system clock using the following method:
Right-click System Clock > Customize Notification Icons > Enable/Disable System Icons.