Click the green flag and watch the time go by. The mnfc prefix in the project name means MetalNumbersForClockRev2 from which the characters for the display came from. This is meant to be a Reference Implementation of MetalNumbersForClockRev2. You can use that project or this project to create your own clock. In the script in the Stage section change displaySeconds from false to true if you want a clock that displays seconds.
This clock was created by using the MetalNumbersForClockRev2 project by CosmicStomper. Here's the link... http://scratch.mit.edu/projects/24663220/ This version mnfcExampleClockRev2 supports a clock that displays seconds and one that does not.