An internal function that evaluates the data item supplied as an argument to determine whether its value conforms to that item’s date transform. If the date item value represents a valid date, the function returns the numeric value one, which is the logical value of true. If the data item value does not represent a valid date, the function returns the numeric value zero, which is the logical value of false.
The IsValidDate internal function evaluates the data item supplied as an argument to determine whether its value conforms to that item’s date transform. If the date item value represents a valid date, the function returns the numeric value 1, which is the logical value of true. If the data item value does not represent a valid date, the function returns the numeric value 0, which is the logical value of false.