What are the time line changes that take place in the Terminator universe?

Nope. In T2, after they destroy the research, they changed the timeline, but not drastically enough. Judgement Day ends up happening a few years AFTER it was meant to happen. But it doesn't really matter, b/c it still happened.

let me make this clear lol first of all james cameron directed terminator one and two... i dont know who the director is for 3 and 4 but they have completely different ideas, if you watch terminator 2 on dvd it has the alternate ending where judgement day never comes.. and the future pegs on without the war.. that was james camerons idea, that you can change fate... there is no fate but what we make... however the new director told cameron he wanted to go on so he made cameron end with the road going on and sarah talking about what ever happens in the future they will be ready. that wasnt what james cameron wanted but he later got his ending put on dvd which is what i liked... they shoulda left it like that but the new director wanted to go on. so now you have a director heading into un explored territory where he makes his own film as he goes on.. at the point of terminator salvation.. there basically isnt a story line at all now.. its just holly wood action and effects.. but at the same time the new director is pushing the idea that you cant change fate you can only delay it. so to answer your question yes judgement day has come sooner because the sky net of the future made it so.. but no matter what happens in johns time line... the future one is still doomed.

no cause john conner takes the chip and the hand throse it in the lava and arnould dies in lava