'Declaration
 
Public Overloads Shared Function DateDiff( _
   ByVal interval As DateInterval, _
   ByVal date1 As Date, _
   ByVal date2 As Date, _
   Optional ByVal dayOfWeek As FirstDayOfWeek, _
   Optional ByVal weekOfYear As FirstWeekOfYear _
) As Long

public static long DateDiff( 
   DateInterval interval,
   DateTime date1,
   DateTime date2,
   FirstDayOfWeek dayOfWeek,
   FirstWeekOfYear weekOfYear
)

Parameters

interval

Required. A DateInterval enumeration value or a string expression representing the time interval you want to use as the unit of difference between Date1 and Date2.

date1

Required. Date. The first date/time value you want to use in the calculation.

date2

Required. Date. The second date/time value you want to use in the calculation.

dayOfWeek

Optional. A value chosen from the FirstDayOfWeek enumeration that specifies the first day of the week. If not specified, FirstDayOfWeek.Sunday is used.

weekOfYear

Optional. A value chosen from the FirstWeekOfYear enumeration that specifies the first week of the year. If not specified, FirstWeekOfYear.Jan1 is used.

Return Value

Reference

DateAndTime Class
DateAndTime Members
Overload List