Cannot pass datetime value programmatically through SqlDataSource to Access 2013 database

ASP.NET form:

<asp:SqlDataSource ID="dsLoan" runat="server" ConnectionString="<%$ ConnectionStrings:connLibrarySystem %>"
                ProviderName="<%$ ConnectionStrings:connLibrarySystem.ProviderName %>"
                SelectCommand="SELECT TOP 1 LOAN.LoanID FROM (BOOKS INNER JOIN LOAN ON BOOKS.ACCESSION = LOAN.ACCESSION) WHERE (BOOKS.ACCESSION = @Accession) ORDER BY LOAN.LoanID DESC"
                UpdateCommand="UPDATE LOAN SET DATE_OF_RETURN = @ReturnDate, OverDate = 3 WHERE (LOAN.LoanID = @LoanID)"><SelectParameters><asp:ControlParameter ControlID="tbAccession" Name="Accession" PropertyName="Text" Type="String" /></SelectParameters><UpdateParameters><asp:SessionParameter SessionField="LoanID" Name="LoanID" Type="Int32" /><asp:Parameter Name="ReturnDate" Type="DateTime" /></UpdateParameters></asp:SqlDataSource>

C# Function

protected void btnBookReturn_Click(object sender, EventArgs e)
    {
        // Select the latest LoanID based on the specified Book Accession
        int loanID = int.Parse((this.dsLoan.Select(DataSourceSelectArguments.Empty) as DataView).Table.Rows[0]["LoanID"].ToString());
        Session["LoanID"] = loanID;

        // Update the Return Date of the corresponding loan record to today
        this.dsLoan.UpdateParameters["ReturnDate"].DefaultValue = DateTime.Today.ToShortDateString();

        // Update the Loan record
        this.dsLoan.Update();

After the update is completed, the Overdate column in the target record is updated but the DATE_OF_RETURN column remains unchanged.

Even if I have insert the following code snippet inside the SqldDataSource and update the C# code as belows,

OnUpdating="dsLoan_Updating"

    protected void dsLoan_Updating(object sender, SqlDataSourceCommandEventArgs e)
    {
        e.Command.Parameters["ReturnDate"].Value = DateTime.Today;
    }

The problem still occurs.

Please advice how to solve this problem. Thanks in advance.