I am ignorant myself, but would like to uncomplicate the concept a little. A very silly question indeed, but nevertheless very profound. Many fool around thinking they know what it is.

It is time, something which cannot be precisely defined but can be certainly understood in terms of quantities which are accessible to the less perceptive human mind.

It is that thing which is always conceived after it is lost, which was present in the past and definitely exists in the present and may be present in the future.

What is time? This question asked again after an explanation would still result in a confused answer, revealing unsure concepts of time. So why waste time in defining what is not to be defined.

Finally, summing up all arguments and opinions, I would suggest that coming to a conclusion about this passage would devour a sizeable amount of your time. Stop pondering over the conclusion. For what happens to be distant future will be present and in an instant become remote past - lost forever.

Think not about time, but its worth, its value, its occurance, its dynamism, its velocity and its approch - START NOW.