The Rumi Calendar was used on the last of the Ottoman Empire's banknotes and on the first of Turkey's coins and notes. Could it please be added? Here's a link to a
Wikipedia article (which could be better) and a description from
Bank Note Museum. A temporary fix has been applied to the coins (see
here for discussion) but it will be easier to tackle the notes if the calendar is in the dropdown options. The conversion is AD = RC + 584, although the RC new year was in March until RC1334 (AD1918).
Former Numista referee for banknotes from Ireland, Northern Ireland, Scotland, Wales and Saint Helena.