This function returns a number list in a result of evaluating math_time_expression against each of the issues in argument issues.
Argument math_time_expression is a math/time expression, where references to field values of issues in argument issues are done with prefix ^
before field code, e.g., ^{00012}
is field code for Due date in each of the issues in argument issues.
mathOnIssueList(issue list issues, number math_time_expression) #Output: Number list