The change of the state of motion of physical systems is characterized by the change of its velocity; an important aspect of Relativity Theory (RT). Quantum mechanics (QM) implies space-time itself may be quantum in nature if QM is to comply with RT geometrically; i.e. Loop quantum gravity theory (LQG) as a quantum space-time. The nature of time and its intimate relationship with space as described by RT is not so obviously defined but dealt with as an abstract entity that exists in physical reality. But physical reality demands similar dynamical space-time notion as mostly expressed by LQG. Here, following the concept of quantum space-time, I describe time as a numerical value of space such that the rules of RT are satisfied. Length contraction, time dilation and the forward arrow of time are explained accordingly. The intention here is to add dynamical aspect to the notion of time by defining it as a property of the dynamical space itself under the rules of RT but adding a dynamic aspect to it as LQG requires.