If you change your computers date and time setting a whole 24 hours forward after receiving a daily xp reward on Save The World, then play a new game and finish it, you will get another daily xp boost, and it gives you a pretty decent amount because its only meant to be once a day, you can do this as many times as you want.
And since its nothing but changing your time and doesn't interfere with anything in the game, its pretty much impossible to get banned for it unless you go bragging about it.
