<input type="text" name="start_time" maxlength="10" onclick="WdatePicker({dateFmt:'yyyy-MM-dd'})" placeholder="请选择开始时间">
<input type="text" name="end_time" maxlength="10" onclick="WdatePicker({dateFmt:'yyyy-MM-dd',minDate:start_time.value})" placeholder="请选择结束时间">