DateDiff Function
Syntax
                                                    DateDiff(interval, dateexpr1, dateexpr2)
                                                    
Group
                                                    Time/Date
                                                    
Description
                                                    
Return the number of intervals between two dates.
                                                    
                                                        
                                                            
                                                                
                                                                    | Parameters | Description | 
                                                                
                                                                    | interval | This string value indicates which kind of interval to subtract. | 
                                                                
                                                                    | dateexpr1 | Calculate the interval from this date value to dateexpr2.
If this value is Null then Null
is returned. | 
                                                                
                                                                    | dateexpr2 | Calculate the interval from dateexpr1 to this date value.
If this value is Null then Null
is returned. | 
                                                            
                                                        
                                                    
                                                    
                                                        
                                                            
                                                                
                                                                    | Interval | Description | 
                                                                
                                                                    | yyyy | Year | 
                                                                
                                                                    | q | Quarter | 
                                                                
                                                                    | m | Month | 
                                                                
                                                                    | y | Day of year | 
                                                                
                                                                    | d | Day | 
                                                                
                                                                    | w | Weekday | 
                                                                
                                                                    | ww | Week | 
                                                                
                                                                    | h | Hour | 
                                                                
                                                                    | n | Minute | 
                                                                
                                                                    | s | Second | 
                                                            
                                                        
                                                    
See Also
                                                    DateAdd, DatePart
                                                    
                                                    
Sub Main
    Debug.Print DateDiff("yyyy",#1/1/1990#,#1/1/2000#) ' 10
End Sub