Past, present and future United (Harry Potter fanfic)

The marauders

I had just boarded the hogwarts express, found a seat and had taken out my time turner to see how it worked. Professor McGonagall had given me the time turner last year as I wanted to study a variety of subjects and I hadn't found out how it worked as we are unable to use magic outside of school. I was staring at the golden necklace when Remus entered behind the other marauders.
"So how was your holidays Evans?" I tried to walk past me but Black gave me a push back and I fell over, but that wasn't the worst of it as I was getting up the sand out of the necklace was pouring out and before I knew it we disappeared and then reappeared, the walls looked older but the same, I looked out the window and to my surprise different students were dragging cases down the train. I slammed the door and stared at Potter, this was all his fault! "Way to go Potter! We were just sent to the future by how many years I don't know, but we have no way of getting back thanks to you idiots!" Potter, Black and Pettigrew all looked at me confused but Remus, thank god for him looked just as worried as I felt. "Remus can you explain what just happened, because you know what they understand and I'm too angry at them" I sat on the chair and listened to Remus explain to the idiots how they just caused major trouble! How were we ment to get home? Oh great now I'm hallucinating there was a second James walking down the corridor. What was happening? How long in the future were we sent? Or how long in the past?