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

public static long DateDiff( 
   string interval,
   object date1,
   object date2,
   FirstDayOfWeek dayOfWeek,
   FirstWeekOfYear weekOfYear
)

Parameters

interval

Required. DateInterval enumeration value or 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