There is no such thing like Present

I had discussion with one of my colleagues at work about how to define our time in present sense. In his opinion, no matter what we are doing, there is no such thing like Present. The moment I will finish typing this line or even this word will be counted as past because the work has already been done. My colleague argued that there is no such thing as a current time because the moment we define that time or we want to live up to that point, that second will be lost for ever. And, hence, there is only past and immediate past, next past, next past and so on.

In counter argument, I said, although this sounds right, it can't be. If there is a past and there will be a future then there has to be Present. Otherwise, none of those two things will happen. I had to do a bit search on this topic to understand what present time is and what it really means.

According to wikipedia, and according my understanding of it now, one can only see or work on his/her present time. It is not possible to observer other's present time. No matter how close you stand to the next person, time is always relative. As Einstein has already proven that space and time are relative, I can see only my present time and no one can because by the time observer gets that information and process it, it is already become a history.

Although time frames are almost same to people in one room or in one city due to small relative motion, reference to time is always different for each and every object. This is very hard to see in our everyday life and most of the time difference is very small that we don't need to worry about. Nevertheless, this time difference is significant for few technologies to work properly, for e.g. GPS.