datepicer set now date an change date format with jquery

html

<input class="form-control date-picker" type="text" 

data-date-format="dd-mm-yyyy"  id="op_date" 

name="op_date" autocomplete="off"/>          

jquery

$("#op_date").datepicker({
    currentText: "Now",
    dateFormat: "yy-m-dd"});