The best description of the present moment Mr Tolle wrote" it is what it is, otherwise it can't be". At each moment there are literally no past or future, they are nothing more than thoughts in our heads. They are inaccessible. Only by paying attention to our thought process without judgment, they start to calm down, lose their energy, and allowing the present moment to emerge in our awareness.
As you said The Power of Now has the potential to change the way you perceive time and consequently life completely.
Thanks @jasimg for spreading such knowledge. :)