My island tends to be 2-5 hours behind my time because I stay up till like 3-5 am. I wouldn't be able to experience morning in game if I didn't do this.
My island is in limbo right now though in case some friends want to sell turnips tomorrow. My time on switch is at 5:38 pm. I stopped playing around a halfhour ago.
Right now, my clock is actually set at 6:51 PM. I play at strange hours, and also like to have my shops be open when my best friend and I play and she comes over to visit my island, so I do some light time travel. I used to time travel multiple days per real day in New Leaf and the older games, but with content being implemented through patches this time around, I play basically day-to-day so as not to overshoot any upcoming events we don't know about yet, so it is in fact 5/20 in my game today.