Once you’ve ended the day either by waiting by the campfire or by heading into ur home, just simply head back out through the front door
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Either go in the house or wait at the campfire. Both end the day. Once in the house (Still on day one), you can leave through the door to enter the night area. (Leaving through the door used to start the next day before this update.) It warns you before heading because it can be quite tough (although, hot >///<)