Rubik's Clock

A simple Rubik clock puzzle.
There are 18 clock faces, 9 on each side of the clock puzzle.
With the help of 4 sets of /- buttons (simulating the turning wheels) and another 4 selector buttons, the aim is to make all 18 clock faces show 12 o'clock.
The button will increase the clock digit by 1, - decrease by 1.
If the selector button closest to the /- buttons is selected, then pressing the /- buttons will increase/decrease all 4 clock faces surrounding the selector button, as well as all other clock faces that surround their respective selector button which is also selected.
If the selector button closest to the /- buttons is **not** selected, then pressing the /- buttons will only increase the single clock face at the corner closest to the /- button, as well as any other corner clock faces which have their respective selector button **unselected**.
This Rubik game can be played with only 1 side shown at a time. It can also be played with both sides showing side-by-side.
Once the puzzle is solved, use the timer to do the challenge. The top few records for solving this Rubik puzzle using the physical device are all below 5 seconds!
Have fun with this Rubik clock game!