关于datetimepicker只显示年、月、日的设置

如下是只显示月的sample code：

<link rel="stylesheet" href="css/datetimepicker/bootstrap-datetimepicker.min.css">
<script src="js/datetimepicker/bootstrap-datetimepicker.js"></script>

<input type="text"  class="form-control form_datetime_2" readonly style="background:#fff" placeholder="开始时间" id="begin_month_time"/>

//只显示年的

<script>
$(".form_datetime_2").
    datetimepicker({
    language:\'ch\',
    format: \'yyyy\',
    autoclose: true,
    todayBtn: true,
    startView: \'decade\',
    minView:\'decade\',
    maxView:\'decade\',
});

</script>

//只显示月的

<script>
$(".form_datetime_2").
datetimepicker({
    language:\'ch\',
    format: \'MM\',
    autoclose: true,
    todayBtn: true,
    todayHighlight: true,
    startView: \'year\',
    minView:\'year\',
    maxView:\'year\',
});
</script>

<script>
    $(".form_datetime_2").
    datetimepicker({
    language:\'ch\',
    format: \'dd\',
    autoclose: true,
    todayBtn: true,
todayHighlight: true,
startView: \'month\',
minView:\'month\',
maxView:\'month\',
});
</script>