Move to next item in array

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Probably a really simple answer that I'm over looking, but if you have an array

dumbarray = {1,2,3,4,5}
and you set it to 1 onCreated(),
what would you move to move it to 2?

Im using it with a time script to do days, and I prefer to do it this way since i have hours resetting at 24. Was simply going to tell the serverr.var to move when it resets.