misconvert

mis- +‎ convert

misconvert (third-person singular simple present misconverts, present participle misconverting, simple past and past participle misconverted)

1. (transitive) To convert incorrectly.
   • 2007, Ian R. Bartky, One time fits all: the campaigns for global uniformity (page 222)

     Of the fifteen station entries in the Cork-London double timetable, Fleming misconverted all five Irish times by making them twenty minutes ahead of Greenwich instead of twenty-five minutes behind […]

• misconversion