There is scientific and intuitive answer to this. But first, we have to define some terms. Are you amiable to a term "pre-existence" or something to this effect? This means existence before having existed. Before we get dizzy with semantics, let me qoute from Einstein's Special Theory of Relativity. Every point in the Space-Time continuum is described along its so-called "world line" If this world line did not intersect with another world line, that point did not exist, and is insignificant to be considered at all. So there, you get it from the genius himself. In the Space-Time continuum, if I interpreted it right, there are an infinite number of points in "pre-existence" waiting to have its world line intersected in order to "exist"
In the intuitive side, almost all religions implicitly agree that the real existence is in pre-existence. Call it what you may, the soul or rarefied matter is the only reality, according to the Buddhist. To the Christians, the soul is the eternal. And so it follows that the physical world is only an illusion. And so are all finite things. Even man. The difference in view that these two main thoughts about "being" had, however, may arise only similar to the case of how you consider which is first, the chicken or the egg? For, the Buddhist consider man as the soul that acquired a body. Reincarnation? The Christians on the other hand, consider man as a body that was given a soul. Creation?
In the scientific view, the soul, the essence of all things is the atom. Science agrees that the atoms are the reality. All other matter are only illusions. How can we say this? It is the atoms that is the building block of all matter. It is an accepted fact that the atom in order to become a different one has just to acquire or loose an electron. So, that same material, just by rearranging will create an illusion of another material. And by the various combinations of the same electrons the illusion of all kinds of matter are formed.
In recapitulation, if you could accept that "pre-existence" is existence, then existence is beyond time and space continuum.