how to set minimum date in datetimepicker using jquery...?

the code i have tired is

@Html.EditorFor(model => model.taxDefination.EffectiveDate, "", new { htmlAttributes = new { @class = "form-control datePickerOnly", @id = "txteffectivefrom", @required = "required", @style = "z-index:99999;", @Value = Model.taxDefination.EffectiveDate.ToString("dd/MM/yyyy") } })

var today = new Date();

var dd = today.getDate() - 7;

var mm = today.getMonth() + 1; //January is 0!

var yyyy = today.getFullYear();

if (dd < 10)

{

dd = '0' + dd

}

if (mm < 10)

{

mm = '0' + mm

}

var today = dd + '-' + mm + '-' + yyyy;

$("#txteffectivefrom").datePickerOnly("option", "minDate", today);

it is not working