Varies between cinnamon versions -
Cinnamon Settings > Desktop - uncheck "Show mounted volumes on the desktop"
System Settings > Desktop ...
Edit: Reading altair4's reply below - I may have misunderstood the question
But .....For the clock:
Click Clock > Date and Time Settings
Click "Switch to Advanced Mode" if haven't already (this only needed If using Cinnamon 1.8+)
On the line - Date format for the panel - try this for the time section after the date:
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