ZDATEBADDATE, $ZDATE() date argument dddd is less than -365 (the $HOROLOG value for 01-JAN-1840) or greater than 364570088 (the $HOROLOG value for 31-DEC-999999)

Run Time Error: The value of the date portion of the argument dddd to $ZDATE() is outside the range of values the function handles.

Action: Examine the code that created the value of dddd for errors or revise the design to create dates within the range supported by $ZDATE().