By date I meant hangout. Hangouts are still slightly buggy, but fixing them completely will take much longer. I will get to that later.
Surviving for more than 365 days will place an NPC on the starting beach. He will stay there pretty much forever and you can talk to him and end the game whenever you like. You old save files will still stay so you can end the game and load your old save back if you want. All the things you unlock by ending the game will be accesible on new saves only though.
If you have the "Basic electrical theory" skill, new sign with a hammer icon should appear left of your tent. You build that upgrade and now you should be able to use the fridge on your food chest and build a shower unit.