Technically it seems like it's four years. We were in 2019 but we moved to 2023.
Anything related to time travel is going to be confusing from the start. From what I sensed through the stone, our universe was lagging behind in time. His was ahead, which is what we dreamed of.
When we met, I had the stone open to work on a problem at hand that only the mystics can solve. The stone latched onto him, and sought to bridge the distance between those of us who were transferred into this universe using the only means it could control: time.
Now we're caught up with our other selves. I expect further dreams will now be in the present.