检查这个

https://jsfiddle.net/sbk2hd4c/11/

您在 div 应该在输入标记中

<div class="container">
    <div class="row">
        <div class='col-sm-6'>
            <div class="form-group">
                <div class='input-group date' >
                    <input type='text' class="form-control" id='datetimepicker1' />
                    <span class="input-group-addon">
                        <span class="glyphicon glyphicon-calendar"></span>
                    </span>
                </div>
            </div>
        </div>

    </div>
</div>