The present moment is an illusion.
Take a moment and think about something that happened yesterday in as much detail as possible. Now seriously question yourself and ask: 'When did that happen?', yesterday, right? Then ask youself: 'WHEN was I thinking about what happened yesterday?', just now, right? And so, next: 'What was I thinking about, when I was thinking about what happened yesterday?', exactly the same thing, yes or no?
The only realistic conclusion you can draw, if you submit to it, is that yesterday never happened yesterday (or at all), it is in fact just a hallucination you're having in the present moment. You can draw exactly the same conclusions about events in the future, they're just the same hallucinations in the present moment.
So what about the present moment? Ok, turn your attention to say, some music playing in the background, pay attention to the lyrics or the melody. Ask yourself: 'WHEN is it happening?', now, right? Ah no, it's gone already, it's already turned into a hallucination of a past moment. It's like trying to grab a pint of running water with your bare fist, you think you have it, but you don't.
So again, the only sensible conclusion you can draw, is that the present moment is also a hallucination. BUT, at least the present moment IS the whole of reality, you just have to come to terms with it being JUST a hallucination.