I made a copy of the table, changing the two date columns to be NVARCAR (10). Loaded the copy with test data and reran the program.
No effect.
Satan (impatiently) to Newcomer: The trouble with you Chicago people is, that you think you are the best people down here; whereas you are merely the most numerous.
- - - Mark Twain, "Pudd'nhead Wilson's New Calendar" 1897