Argument-1 must be an integer of the form YYYYMMDD, whose value is obtained from the calculation: (YYYY * 10,000) + (MM * 100) + DD.
- YYYY represents the year in the Gregorian calendar. It must be an integer greater than 1600.
- MM represents a month and must be a positive integer less than 13.
- DD represents a day and must be a positive integer less than 32 provided that it is valid for the specified month and year combination.