[Kuldeep]

I wish I could contribute " what time is" based on space-time relationship as understood by Einestein and now by ZNFYRH here in this thread. Till I educate myself about this I can only say:

My first definition:
Time is the state of mind you are in at any moment !!!!

You might wonder what I am talking. Just wait I would tell you!!

Explanation:
Suppose I am enjoying very interesting documetary show. I was told that the show would be of three hours. Now while watching the show my mind was so much involved in the show that I was surprised to see that show is over and three hours have passed. This way these three hours look like a twinkling of eye for me. This a was one state of absolute compromising mind with the situation.

Now in the second state of worrying mind, I got a message my relative met with a accident at a place which would take me same three hours to reach even if, I try air travel. Every second of these three hours, I would feel like hours are passing.

Lapsing of three hours in second state of mind would be much much longer than the first state of mind. Rather, it would be difficult to compare.

Definition 2:
Time is sum of all present moments you pass on!

Explanation:
I do not think it is needed!!!