Note about the solution, the difficulty was caused by hidden characters in the variable "Mark_App_s ", which was imported from an online database. Prior to implementing the above solution, I had to parse the variable using a SUBSTRING into MM, DD, YYYY components, Then tried converting each to a numeric variable. If it would not convert using an INPUT function, that indicated there were hidden characters, and I continued to use the SUBSTRING function until the numeric conversion method worked. Only then could the Mark_App_d = mdy(Month_2,Day,Year) function be used to convert the character variables (Month_2,Day,Year) to a SAS Date. Thanks again for your assistance !
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