Anachronically

adv. [f. prec. + -LY².] Erroneously as to date; out of correct chronological position or order; by anachronism.

1

1813. W. Taylor, in Month. Rev., LXX. 133. The statement … is anachronically given after the alteration of the calendar.

2

1866. Songs & Bal. Cumbld., 439, note. Friends of the author introduced here anachronically.

3