4x7 segment display

Hello Arduino forum.

I am trying to make a digital watch, but I'm stuck on a part. I am able to show different numbers on the different displays. The real problem comes when I have to make to make the numbers start counting.

I'm not sure if how to do it, but I have an idea.

I want the loop to keep turning on and off the different displays, and then want my switch to change the different numbers shown on the displays. However I dont know how to make the switch change the displays in my loop, or how to define my displays, so that I can switch around between them.

Is it wrong to define a x and a y, to make the the display number switch around?

Thanks.

Attached are my loop, my switch and my displays.

Skærmbillede 2017-04-05 kl. 12.24.18.png

Skærmbillede 2017-04-05 kl. 12.28.32.png

Skærmbillede 2017-04-05 kl. 12.28.45.png