        <input placeholder="开始日期" class="form-control layer-date" id="start_time" name="start_time">
                                <input placeholder="结束日期" class="form-control layer-date" id="end_time" name="end_time">
                            </div>
                        </div>


                        <div class="form-group" id="div_step_size">
                            <label class="col-sm-2 control-label">步长</label>
                            <div class="col-sm-10">
     