What is time? - David Albert

Time is nature's way of keeping everything from happening at once. 

~Woody Allen

Time appears in physics is as another component in the address of an event. It's hard to know how to do that people talk about time, flowing a common question that gets asked of such people is how fast is it flowing? The normal answer is: I don't know. [........] The next question is: What would it be like if it were flowing two seconds per second instead of one second per second?

For more information, let's watch the video.