Reset the value of datetime picker to blank so that user can apply filter

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C#

ASP.NET

I have a datepicker on my page it is for filter use when i remove the date on lost focus it is assign date again i want if the date is removed then it should be blank
here what i tried
please suggest something its urgent

What I have tried:

<div class="span2 unit">
                                  <label class="label">Date of Birth</label>                         	
                                    <div class="input">                                    
                                        <label class="icon-right" for="singleDatePicker">
                                            class="fa fa-calendar">
                                        </label>
                                        <input class="form-control" id="singleDatePicker" placeholder="Date..." type="text"/>
                                    </div>
                                </div><!--span3-->

$("#singleDatePicker").keyup(function (e) {
    if (e.keyCode == 8 || e.keyCode == 46) {
        $('#singleDatePicker').val('');
       // $.datepicker('setDate', null);
        //$.datepicker._clearDate(this);
    }

});