ช่วยด้วย อยากได้ bootstrap datepicker year (ปีพ.ศ. พุทธศักราช)

 <select name="year" id="year" class="form-control">
                        <option value="">:: Year ::</option>
                          <?php for($i=0; $i<=3; $i++) { ?>
                        <option value="<?php echo date("Y")-$i; ?>"><?php echo date("Y")-$i+543; ?></option>
                          <?php } ?>
                      </select>

<style>
.year-picker .ui-datepicker-calendar,.year-picker .ui-datepicker-month{display: none;}
</style>
<script>
$(function() {
$("#datepicker").datepicker({
    changeYear: true,
    showButtonPanel: true,
    dateFormat: 'yy',
    stepMonths: 12,
    beforeShow: function(){
        $("#ui-datepicker-div").addClass("year-picker");
    },
    onClose: function(dateText, inst){
        var year = $("#ui-datepicker-div .ui-datepicker-year :selected").val();
        $(this).datepicker('setDate', new Date(year, 0, 1));
    }
});
});
</script>