IsValidDateField – Check whether a date is valid

Enum psDateTypes    AnyValidDate    'Allows any valid date to be entered    PastDate        'Only allows past dates (before today) to be entered    FutureDate      'Only allows future dates (after today) to be entered    TodayOrFuture   'Only allows today or future date to be entered    TodayOrPast     'Only allows today or a previous day to be enteredEnd Enum' Validate attributes of date data' Returns True if valid, False if invalid'' Example:'  If IsValidDateField(Value:="01/30/2001",'  '       DateType:=psDateTypes.FutureDate, IsRequired:=True)Function IsValidDateField(Value As Variant, Optional ByVal DateType As _    psDateTypes = AnyValidDate, Optional ByVal IsRequired As Boolean = True) As _    Boolean    On Error GoTo ErrorHandler        Dim lngDate As Long    Dim lngToday As Long    IsValidDateField = True    If IsRequired = True Then        If IsNull(Value) Or Value = vbNullString Then            IsValidDateField = False        End If    ElseIf IsNull(Value) Or Value = "" Then        Value = Null        Exit Function    End If    If IsDate(Value) Then        lngDate = Format$(Value, "yyyymmdd")        lngToday = Format$(Now, "yyyymmdd")        Select Case DateType            Case psDateTypes.FutureDate                If lngDate <= lngToday Then                    IsValidDateField = False                End If            Case psDateTypes.PastDate                If lngDate >= lngToday Then                    IsValidDateField = False                End If            Case psDateTypes.TodayOrFuture               If lngDate < lngToday Then                    IsValidDateField = False                End If            Case psDateTypes.TodayOrPast               If lngDate > lngToday Then                    IsValidDateField = False                End If        End Select    Else        IsValidDateField = False    End If    Exit Function    ErrorHandler:    Err.Raise Err.Number, "IsValidDateField", Err.DescriptionEnd Function'###########################################################'#'#   This rountime has been brought to you by '#   Pragmatic Software Co. Inc, the creators of Defect Tracker, '#   the tool of choice for tracking functional specifications, '#   test cases and software bugs.'#   Learn more at http://www.DefectTracker.com.'#   Affiliate program also available at '#   http://www.PragmaticSW.com/AffiliateSignup.'#'###########################################################

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