According to MySQL documentation (), the format should be 'YYYY-MM-DD', including the single quotes. If what you are saying '2018/05/27' works in your "direct select" test, then you need to include the single quotes with your date that your are submitting to jRDC, otherwise, you are not really doing the same thing (since you are using single quotes to delimiter your date in the "direct select", but you are not when submitting to jRDC).