install a clock gadget or program using the synaptics installer. You are probably using ("Rocket G", or "Space") because both Enlightenment (E17) desktop based versions (gOS 1, and Rocket E) have a clock per default, gOS 1's clock is Huge! So you need a clock program for the Gnome desktop, just search Synaptics for "clock", and install a clock program.

BTW There should be a clock/date gadget in the top right hand corner, I assume that one is too small or something?