Summary: Back in 1983, theorists Don Page and William Wootters devised a theory of time based on quantum entanglement.They showed how this entanglement could be used to measure change. The results, however, vary depending on how the observation is made. If the change is measured against a clock outside and entirely independent of the universe, then appears that the particles are unchanging and thus time does not exist. These anomalies go away once the clock is moved inside the universe.
Just recently, scientists in Italy have been able to perform experimental proof of this theory by creating a toy universe to observe. This experiment is a step on the way to learning more about gravity.
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