Question

Why time is not considered as a vector quantity though it has a direction? ​

Answer 1

Time has no direction .
It follows the scalar laws

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Answer 2

$\bf\large{Hey \: there!!}$

A vector quantity is a quantity that is dependent upon directions.

For example: If we consider a car heading from Houston to Austin. Let the car moved with a constant speed (s) throughout its journey. But we know that a constant speed doesn't guarantee a constant velocity as the direction of the car, as it turns, is different . Thus, Velocity is a vector quantity, which means it is dependent upon directions.

Through the above example we came to know that a Vector quantity is dependent on directions. This means that as direction changes the vector quantity also changes (not in magnitude, but direction) and thus is called a vector quantity as it is dependent upon direction.

Now, your question, totally, moves around the meaning of the statement italicized and emboldened above.

This italicised statement means that- A quantity whose direction changes with respect to time is called a Vector Quantity and it does not mean that every quantity that having a direction is a Vector quantity.

In short, a quantity whose direction changes(multi-directional) is a vector quantity and a quantity having direction(but it doesn't change i.e., Uni-directional) is not a vector quantity.

Now, coming to “TIME”. Time is a fundamental quantity having a direction and this direction is always forward i.e., you always move forward and never the reverse in time. Thus, the direction of time is only in one direction(i.e., forward) or you can say that time is uni-directional.

Since, direction of time does not changes, therefore, it is not a vector quantity.

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I hope, that, I was able to explain you the Concept Of Vectors.

If you face any doubts, feel free to reach me.

@WilliamTheRoyal.