compare validator not validating properly

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VB

validation

Hi,
I have a compare validator on my textbox(code below) in my page load it sets the value to compare. I want the value in the textbox to be less than the current date. If i select a value less than the current date it stills give me an error. any thoughts?

<asp:TextBox ID="txtDOB" runat="server" CssClass="form-control" TabIndex="5" Width="100%" onchange="CalculateAge();" BackColor="White" ValidationGroup="validateCurrentDate"></asp:TextBox>
                    <ajax:CalendarExtender id="txtDOBCalendar" TargetControlID="txtDOB" Format="dd-MMM-yyyy" OnClientHidden="onCalendarHidden" OnClientShown="onCalendarShown" runat="server" BehaviorID="calendar1"></ajax:CalendarExtender>
      
                   <asp:CompareValidator ID="CompareValidatorDateOfBirth" runat="server" ErrorMessage="Greater than current date."
                        ControlToValidate="txtDOB" Operator="LessThanEqual" Type="Date" ForeColor="Red" ValidationGroup="validateCurrentDate"></asp:CompareValidator>

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        CompareValidatorDateOfBirth.ValueToCompare = Date.Now.ToString("MM/dd/yyyy")  
      
    End Sub