Time Dilation From The Human Standing

Years ago I was doing some research into time dilation and people. Einstein touched on this but I decided to expand it. 
Time Dilation from the human standpoint.
When we were young and in school our teachers taught us that two people could not be in the same place at the same time. That is true, as is the statement two people can not be in the same time at the same time.
Einstein proved that space and time are one in the same, spacetime, as such we have to understand that we stand apart in time.
As an example.
Two people are watching the exact same event, either side by side or behind and in front of each other. But lets use the latter.
Jim is standing just in front of Bob and the two are watching a basketball game. Jim sees the game FIRST and then Bob sees the game second. While watching the game Jim is seeing into Bob's future and Bob is seeing Jim's past.
This principle remains true regardless if Jim and Bob are standing next to each other, angle of light.
This time dilation effect also explains why two people CAN'T see the exact same event, the time dilation (although small) between the two has altered the event.
Therefore two people cannot be in the same time at the same time. So how distant are people apart in time, about .008 seconds if memories serves (I wold have to reread some physics books). However the the distance of time remains the same as long as gravit is a constant, but gravity is not a constant.