The ultimate geek timekeeper?  3D Printed DIY Minecraft Binary Clock, yes....

This is a binary clock that was built into a 3d printed case created in Minecraft. It shows the current time in a binary coded decimal format. The model was exported with the free tool Mineways and printed on a Zprinter 650 3d printer, with a block size of 25mm³ (so every block has an edge length of 5mm). After printing, LEDs were glued into the case after filing the openings a bit wider. Then, the LEDs were soldered to form a 4x4 LED matrix, and the matrix was connected to an Arduino board. Next steps will be to tidy up the wiring and add some buttons to set the clock to the right time (right now this has to be done in the code).

More photos here.