This was noticed today, My system doesn't show the clock(I took a Screen-shot), I run it on an HP Laptop with Intel Core 2 Duo and 3 GB of ram(DDR2).
How I fix to show the clock ?
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Maybe it is just deactivated. I've experienced random changes in the settings too, even though not with the clock. You might want to try to change the settings with dconf-editor:
sudo apt-get update sudo apt-get install dconf-editor
Then open dconf-editor and open the path com - canonical - indicator - datetime. There you'll find an option "show-clock" (and plenty more settings...), just tick it and it should work