How to list items on screen from two arrays (2 items at a time)? And using swipe and up/down to move through and switch arrays?

I have two arrays (old and current) containing strings of dates in two formats DDD,HH:MM and YYYY,MM,DD,HH:MM in time and date order. I would like to display them in a list with two strings per screen and scroll up and down using onSwipe and up/down buttons. What i’m unsure of how to do is to switch between the arrays when you reach the end of one. I have attempted to write the code for it (i’d post it but i’m not at the computer right now and it doesn’t work anyway) so i’m wondering if anyone can help me. Thanks