Parachronism n. : An error in chronology, by which the date of an event is set later than the time of its occurrence.

Example:


Taxonomy
free encyclopedia, time period, obsolete technology, verbal expression, search, Unsourced, philosophical idea, musical style, fashion, suburban, United States, laundry, norm, teenagers, oblivion, 18th century, the 19th century, ragtime music.

Defination from the web:
parachronism could be temporary; the music of Johann Sebastian Bach went into nearly-complete oblivion ... It would not be a parachronism in the late 20th Century, when millions deliberately listened to music associated with earlier times. ...