Looked on wikipedia, what does Day 0 mean?
 

could someone help me out, it looked really strange that they officially entered the house on Day 0? :conf2:

Maybe they just class it as Day 0 since its not a full day when they enter idk?

Entered before the show began.

actually even if, they'd still have entered on the first day.

The launch is recorded a day in advance and they show highlights from the first night during the launch. The first night is called Day 0 so that the first Daily Show can show highlights from Day 1.