Wiktionary
behind its time
prep.phr. (context idiomatic English) Showing characteristics of the past; present in one's work after later advances in the field; coming later than could be generally accepted.
Usage examples of "behind its time".
While incidents like these, arising out of drums and masquerades and parties at quadrille, were passing at the west end of the town, heavy stagecoaches and scarce heavier waggons were lumbering slowly towards the city, the coachmen, guard, and passengers, armed to the teeth, and the coach--a day or so perhaps behind its time, but that was nothing--despoiled by highwaymen.