>>150046103
When TDKR came out, it was nebulously meant to be the present day, maybe a few years in the future, since Reagan was president and Batman was thematically meant to be the Golden/Silver Age version(even with aspects like Jason having been Robin.)
Otherwise it was about 10 years into the future from when Batman retired.
TDKR's ending is fairly incongruous with Beyond though, since the mutants end up becoming Batman's footsoldiers the Sons of Batman by the end.