Eckhart Tolle argues the future doesn't exist. Any moment you experience it, even when you're thinking about tomorrow, you're experiencing it now. He invites you to test this yourself: the future is a mental construct that becomes the present when it arrives.
Chapters
The future actually does not exist. This is a bold statement. The future does not exist. And only— I'm not asking you to believe it. I'm asking you to verify in your own life whether or not the future exists. You'd say, okay, I'm going to see if I can I counter the future. You start looking for it tomorrow. Yes, the future exists because tomorrow is going to come, but when it comes, it's the now. Okay, whenever the future comes, it's a now. And even if you could time travel, if that were possible, you would time travel into the future And even then, it's still the present moment. You couldn't experience anything if it were not the— in the present moment. That's all there ever is. So where's the future?