We do it all the time. Of course we do. We travel in time. If we use past and future tense, if we say "I had a pony," or "one day we will get a pony," we are travelling back and forward in time. In our minds. It's useful to have this capability, especially if you can tap into some positive feelings while you are on that journey.
For me, that's a kind of meditation. When I am feeling stressed or upset, I put myself in a place in my past where I felt safe, where I felt loved, where I felt secure. That tiny little 'ping' of recognition of a feeling generates a dose of positivity that can go a long way toward soothing the present and smoothing the way to the future.