The variable name must be prefaced with an ampersand. Use two ampersands if you issue the CONVERT command from within a linear procedure.
A value that contains blank characters must be surrounded with delimiters. Valid delimiters for a substitution variable value are single quotes, double quotes, and parentheses. When the delimiters are quotation marks, the quotation marks are included as part of the value. When the delimiters are parentheses, the parentheses are not included as part of the value.