Question

What is the formula to get the time interval

Answer 1

Answer

Let two events happened at

$(x_1, y_1, z_1, t_1)$

And

 $(x_2, y_2, z_2, t_2)$

Then time interval is given by

$c^2(∆t)^2=∆r^2-∆s^2$

Where

$∆t$ is called time interval between two events.