We have discovered that there is no Absolute Origin of Time there is an inherent limitations to the level we can agree upon the correct time...
These limitations are due to two reasons:
1.Qunatum Fluctuations.(Can not be synchronized as probability comes in to picture and the measuring scenario results in a non standard equipment making the whole world containing multiple realities or standards...)
2.Locations on the Geodesic.(can be synchronized clasically)

So,What is Time ?

Information - > Information Entropy ->Entropy-> Time

Thus Moving Back In Time(locally) = Loss of Information

Where this happens? Any guesses.