This a 6 digit LED 24 hour clock (PIC microcontroller based)
The original design is provided by Steve Gardner's BLOG. His site is located here:SDG Electronics.

Here are some images of the progress and the competed project.

The display multiplex wiring:
Display multiplex wiring

The display sockets set:



Clock running with the colon in the off state:

Clock running with the colons in the off state

Clock running with the colon in the on state:

Clock running with the colons in the on on state