layui 表单验证日期且不许选择之前的日期

1、html

<div class="layui-inline">
    <label class="layui-form-label">过期时间</label>
    <div class="layui-input-block">
        <input type="text" name="date" id="date" lay-verify="date" placeholder="yyyy-MM-dd"
                autocomplete="off" class="layui-input">
    </div>
    <div class="layui-input-block">
        <input type="radio" name="expire_time" lay-filter="expire_time" num="1" value="1个月"
                title="1个月">
        <input type="radio" name="expire_time" lay-filter="expire_time" num="3" value="3个月"
                title="3个月" checked>
        <input type="radio" name="expire_time" lay-filter="expire_time" num="6" value="半年"
                title="半年" checked>
    </div>
</div>

2、js

layui.use(['form', 'laydate'], function () {
    var form = layui.form
        , laydate = layui.laydate;

    // 日期
    var date = new Date();
    var now_time = '' + date.getFullYear() + '-' + (date.getMonth() + 1) + '-' + date.getDate() + '';
    laydate.render({
        elem: '#date',
        min: now_time   // 最小不能小于今天，即今天之前的日期不能选择
    });

})