When I use the Advanced Search and specify Jordan Year 1993 nothing shows up, but searching for Gregorian date 1993 shows the coins. But it seems obvious to me that Year should work as well.
Take a look at the 5 Qirsh coin: https://en.numista.com/catalogue/pieces1736.html
The coin has two dates, AH and Gregorian, on the coin. The 1993 is listed as "1414 (1993)" but it should be listed as "1414-1993 (1993)" and searching for Year 1414 or 1993 should find it. The last column of the years description shows the Arabic digits shown on the coin.
Is the inability to search for the years on the coins through "Year" an inherent limitation of the catalog, or a short-cut taken when the coins are added?