Hello, I am new to SAS Programming and using SAS 9.4. Can someone help me understand the below error and the logic?   I have Startdate (D) mentioned as in following pattern (partial dates) 01:unk:2010:12:null:null  I have run the attached code which displays a note 'Invalid numeric data ':' at line 141 column 21' and 'Invalid third argument to function SUBSTR at line 141 column 9'.  ... View more