Noted, Pecoflyer about the sample data. Thank you Xor and Arvi. I got confused by the "DAY" in both of your formula and when I removed it just leaving the "ObR" as the reference, the result is still the desired format, 2019-01-001. I need to explore further the function of the two negatives before the formula. I tried deleting the negatives but the formula returned 2019-1-1.