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There's several buttons in the circuit. If you figure out what those do, the laws of time of this circuit's universe are yours to behold.

Note to future me to fix the following bug (if it even exists in the real world due to propagation delay). 

The set 1 function of #2 works in the sub-circuit but fails to work for the output pulse in the main circuit. This is troubling to say the least. So I've decided to change hour 12:00 to 00:00. 

A MOD-10 up asynchronous counter is a digital circuit that counts in base-10 (decimal) using flip-flops and asynchronous inputs. The "MOD-10" designation indicates that the counter will reset to zero after reaching the count of 10. The term "up" signifies that the counter increments its count sequentially from 0 to 9. Asynchronous inputs allow for individual flip-flops to trigger a reset, enabling flexible control of the counting sequence.

When connected to a seven-segment display, the MOD-10 up asynchronous counter can visually represent the count in decimal digits. A seven-segment display consists of seven LED segments arranged to display numeric characters (0-9). Each digit of the counter's output is decoded and mapped to the corresponding segments of the seven-segment display, creating a visual representation of the current count.

This combination of a MOD-10 up asynchronous counter and a seven-segment display is commonly used in digital electronics for applications such as digital clocks, timers, and other devices where a visual representation of numeric values is required.