Testing Time

So he said to me ? How do you test time, My answer had to be subtle and not quite obvious that I didn't have a clue at this point in time.
Well I said to him by way of a reply, do you have the present time on your watch?
Yes he replied I do. And would you like me to tell you the time now.
Oh yes was my quick reply, I didn't want this opportunity to vanish.
Well it is exactly! Stop I shouted, Lets just assume that I have just tested time?
TBC...