Was it following a fixed time theory?

Now I know the time travel theory per se is not an important part of this film's plot, nor are there any obvious temporal paradoxes in the movie.

But I was just curious...when Wells and Amy go 3 days into the future, they read the paper about Amy's death...they try to change the future but they fail to and Amy is believed to be dead anyway, though of course it turns out that the paper was wrong and her friend was the dead woman...still, they weren't able to really CHANGE the future...

For those of you who don't know, the fixed time theory is one which suggests that the past cannot be changed simply because anything that happened had 'already' happened...and if you try to change the past, you only end up becoming part of the history you know about (you may even have CAUSED it)...its the theory used in various time travel movies, including Twelve Monkeys and The Time Traveller's Wife.

That said, I've always wondered what HG Wells would have thought about all these modern day discussions about time travel theories and paradoxes...his story featured only travel into the future, not the past, but I wonder how he would have handled the issue of travelling into and possibly changing the past.