If date is prior to min_date, sets date equal to min_date. If date falls after max_date, sets date equal to max_date. Otherwise, date is unchanged. Either of min_date and max_date may be NULL. All non-NULL dates must be valid.
minimum accepted value for date
maximum accepted value for date
If date is prior to min_date, sets date equal to min_date. If date falls after max_date, sets date equal to max_date. Otherwise, date is unchanged. Either of min_date and max_date may be NULL. All non-NULL dates must be valid.