I say that all we experience is happening in the mind. Everything we perceive outside of ourselves is actually inside our mind. When we look outward we are actually examining our own mind - the Universal Mind - which is the only thing that actually exists
In this model, time and space are illusions, neither actually exist. What we perceive as the past is what is happening NOW in the lower aspects of our unconscious mind. The future is what is happening NOW in our super-conscious mind. We live in an eternal moment of infinity which has no beginning and no end.