Public Function construct( _
    Optional ByRef iTimestamp As Variant = Null, 
    Optional ByVal iFormat As String = Empty
) As DateTime

Public Function instance( _
        Optional ByRef iTimestamp As Variant = Null, _
        Optional ByVal iFormat As String = Empty _
) As DateTime

Public Function add( _
        ByRef iInterval As Variant, _
        Optional ByVal iOnlyAddReturnDateTime As Boolean = False _
) As DateTime

Public Function minus( _
        ByRef iInterval As Variant, _
        Optional ByVal iOnlyAddReturnDateTime As Boolean = False _
) As DateTime

Public Function diff( _
        Optional ByRef iTimestamp As Variant = Null, _
        Optional ByVal iAbsolute As Boolean = False _
) As DateInterval

Public Function format( _
        ByVal iFormat As String, _
        Optional ByVal iFirstDayOfWeek As VbDayOfWeek = vbMonday, _
        Optional ByVal iFirstWeekOfYear As VbFirstWeekOfYear = vbFirstFourDays _
) As String

Public Function serial( _
        Optional ByVal iYear As Variant = Null, _
        Optional ByVal iMonth As Integer = 1, _
        Optional ByVal iDay As Integer = 1, _
        Optional ByVal iHour As Integer = 0, _
        Optional ByVal iMinute As Integer = 0, _
        Optional ByVal iSecond As Integer = 0, _
        Optional ByVal iOnlyAddReturnDateTime As Boolean = False _
) As DateTime

Public Function trunc( _
        Optional ByVal iInterval As String = "D", _
        Optional ByVal iOnlyAddReturnDateTime As Boolean = False _
) As DateTime

Implementierung meiner Funktion [VBA] strToDate() in die [VBA] DateTime

Public Function createFromFormat( _
        ByVal iDateS As String, _
        Optional ByVal iFormat As String = vbNullString, _
        Optional ByVal iParams As dtStringParams = dtStringIgnoreCase, _
        Optional ByVal iResetCache As Boolean = False _
) As DateTime