SR showed this to be incorrect. There is no universal cross-section of the Universe, no universal now. Each of us has our own path through space-time, and we each define our own "now", which will not necessarily agree with someone else's "now". My "now" is no longer the piece of paper I'm sat on, but rather a a slice through the stack of paper at an angle, and your "now" might be a different slice, so that some things I regard as happening in my past, you may regard as yet to occur.
Are you saying that an event in my past may be an event in your future? I don't get it! Both of us set our watches by Greenwich!