अक्सर पूछे जाने वाला सवाल

Because humans are echoes of the past.

Most of the synopses for this film say it takes place 300 years in the future which would put it around 2328. The film itself simply opens with saying "Many Generations Later...". It's possible the script was more specific and the filmmakers wanted to make it more ambiguous.

So anywhere from 100-300 years is likely.