  Although time is one of our most intuitive physical concepts, its
understanding at the fundamental level is still an open question in physics.
For instance, time in quantum mechanics and general relativity are two distinct
and incompatible entities. While relativity deals with events (points in
spacetime), with time being observer-dependent and dynamical, quantum mechanics
describes physical systems by treating time as an independent parameter. To
resolve this conflict, in this work, we extend the classical concept of an
event to the quantum domain by defining an event as a transfer of information
between physical systems. Then, by describing the universe from the perspective
of a certain observer, we introduce quantum states of events with
space-time-symmetric wave functions that predict the joint probability
distribution of a measurement (observation) at $ (t, {\vec x}) $. Under these
circumstances, we propose that a well-defined instant of time, like any other
observable, arises from a single event, thus being an observer-dependent
property. As a result, a counterfactual asymmetry along a particular sequence
of events within a stationary quantum state gives rise to the flow of time as
being successive "snapshots" from the observer's perspective. In this proposal,
it is the many distinguishable states in which the observer stores information
that makes the existence of time possible.
