SOLVED. YA Fantasy about two time travelling groups fighting each other. Read around 2005-2008.

[Kit]

I wish I could remember more about this book but I'll try my best. I would've read it around 2005-2008. The protagonist was a boy, and he was part of a group of secret time travellers. I'm pretty sure they travelled through portals to specific time periods I think in order to either fix events that had gone wrong in the past, or to ensure that they went as expected. There was a rival faction who were also time travelling to the past to mess up the events, make them go wrong, or put people into power that they wanted there, and it was a back and forth between the heroes and the villains to make history go the way they wanted. For some reason I want to say the 'good' faction wore green clothing and the 'bad' one wore purple but that could be totally wrong.

[Jordan Mills]

Sounds a bit like Palimpsest by Catherynne M. Valentine but that was published in 2009. Do you remember a part about total matter conversion of a sun to extend its useful life and a barren planet under a dark star?

https://www.goodreads.com/book/show/3...

[Pony]

Possibly The Missing series by Margaret Peterson Haddix? Book one is called Found.

[Chedva]

Not sure if this fits 100% but what about the Pendragon series by D.J. MacHale?

[CorkyNSam92]

This sounds like an interesting book.

[Kit]

Ah thank you all for your contributions but I managed to find it! It's the Guardians of Time trilogy by Marianne Curley.

[Kris]

Glad you found your book series, Kit.

Guardians of Time series by Marianne Curley - book one is The Named