The INTEGER-OF-DATE function converts a date in the Gregorian calendar from standard date form (YYYYMMDD) to integer date
                  form. The type of this function is integer. 
                  
 
            
            
               General Format
 
               	  
               	  
 
               
              
            
            
               Arguments
 
               	  
                
                  	 
                  - 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. 
                           		  
                        
 
  
            
            
               Returned Values
 
               	  
                
                  	 
                  - The returned value is an integer that is the number of days by which the date represented by argument-1 succeeds December
                     31, 1600, in the Gregorian calendar.