Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future.- Time
The concept of the past is derived from the linear fashion in which human observers experience time, and is accessed through memory and recollection.- Past
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The future is the time after the past and present.
The present (or here and now) is the time that is associated with the events perceived directly and in the first time, not as a recollection (perceived more than once) or a speculation (predicted, hypothesis, uncertain).
It is a period of time between the past and the future, and can vary in meaning from being an instant to a day or longer.
In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold.
2-5) makes the appearance that of two right circular cones meeting with their apices at O. One cone extends into the future (t>0), the other into the past (t<0).