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By defining ONE class that has references to ALL the parts and data needed to display the clock.
One of the fields in the class would be a reference to the text field.
Having the data in separate...

What are the 3 arraylists for? Could the data they contain be held in one class and instances of that class placed in a single arraylist?


The posted code still is creating a new arraylist every...

Create a class to hold all the data for a time display. Put instances of that class in a collection/list so it can be used to update the time and anything else about the display.

This is strange. Why use an array here:

clockDisplay = new JPanel[1];

The lists need to be created BEFORE the action listener method is called so the new times can be saved in it.
...

There needs to be a list of the labels to be updated. The current code has a single reference to a label to be updated.

How are each of the clock's displays handled so that each can be updated?
I expect to see a collection of some kind where the displays are saved so that the timer can go through the displays saved...

Ok, no hurry. I'll wait.

Do you have a main() method for testing the code?