I am having a syntax problem when inserting a date in my SQL. Anyone can know what this is causing that?

        loDataProvider.ParameterClear()
        ldDate = Date.Now
        loDataProvider.oParameters.Add("@AddUser", Framework.App.nNoMember)
        loDataProvider.oParameters.Add("@AddDate", ldDate)
        loDataProvider.oParameters.Add("@ModUser", Framework.App.nNoMember)
        loDataProvider.oParameters.Add("@ModDate", ldDate)
        loDataProvider.oParameters.Add("@Detail", "This is my detail")
        loDataProvider.oParameters.Add("@Command", "Test")
        If loDataProvider.SQLInsert("INSERT INTO WebService " + _
         "(AddUser,AddDate,ModUser,ModDate,Detail,Command,Result) VALUES " + _
         "(?,?,?,?,?,?,""String"")", Framework.App.aConnection(1)) = False Then
            MessageBox.Show(Framework.App.cError + loDataProvider.cSQL)
        End If

Basically, this provides a data type mismatch. This is an insertion into a VFP table. AddDate and ModDate are datetime fields. What am I missing?