组件使用了vant-weapp UI组件库，结合van-popup,van-datetimepicker封装。

组件页面如下：

<view class="ui-datetime-picker">
    <view class="model-wrapper">
        <van-cell custom-class="global-cell" title-class="{{ !myValue ? 'cell-title-placeholder' : '' }}"
            title="{{ myValue || placeholder }}" is-link="{{ !readonly }}" border="{{ false }}" bind:click="showPicker">
        </van-cell>
        <view class="icon-close" wx:if="{{ clearable && myValue }}">
            <van-icon name="close" catchtap="handleClear"></van-icon>
        </view>
    </view>
    <van-popup show="{{ popShow }}" custom-style="padding-bottom: 40rpx" position="bottom"
        bind:click-overlay="closePopup">
        <view class="picker-title" catchtap="closePopup">
            <view class="arrow-down">
                <iconfont class="arrow-down-icon" name="i_arrow" size="72"></iconfont>
            </view>
            <view>{{title}}</view>
        </view>
        <van-datetime-picker column-class="ui-datetime-column"  value="{{ currentDate }}" type="datetime" min-date="{{ minDate }}" max-date="{{ maxDate }}"
            show-toolbar="{{ false }}" visible-item-count="5" bind:change="onChange" />
        <van-button data-datestr="{{ currentDate }}" class="picker-btn"  type="info" block  bind:click="handleOK">确定</van-button>
    </van-popup>
</view>

组件js如下：

// Components/PopDateTimePicker/index.js
import { eptimes } from '../../utils/eptimes';
Component({
    /**
     * 组件的属性列表
     */
    properties: {
        title: {
            type: String,
            value: ''
        },
        readonly: {
            type: Boolean,
            value: false
        },
        initData: {
            type: String,
            value: '',
            observer: function(newVal) {
                if (newVal) {
                    this.setData({
                        myValue: eptimes.outTime(new Date(newVal), 'yyyy/MM/dd HH:mm:ss')
                    })
                } else {
                    this.setData({
                        myValue: ''
                    })
                }
            }
        },
        placeholder: {
            type: String,
            value: ''
        },
        minDate: {
            type: null,
            value: new Date(1990, 1, 1).getTime()
        },
        maxDate: {
            type: null,
            value: new Date(2099, 12, 31).getTime()
        },
        clearable: {
            type: Boolean,
            value: false
        }
    },
    options: {
        styleIsolation: 'shared'
    },
    /**
     * 组件的初始数据
     */
    data: {
        myValue: '',
        popShow: false,
        currentDate: new Date().getTime(),
    },
    /**
     * 组件的方法列表
     */
    methods: {
        onChange(event) {
            let dateArr = event.detail.getValues();
            let dateStr = new Date(`${dateArr.slice(0,3).join('/')} ${dateArr.slice(3).join(':')}:00`).getTime();
            this.setData({
                currentDate: dateStr,
            });
        },
        showPicker: function() {
            this.setData({
                popShow: true
            });
        },
        closePopup: function() {
            this.setData({
                popShow: false
            });
        },
        handleClear() {
            this.setData({
                myValue: ''
            });
            this.triggerEvent('setValue', '');
        },
        handleOK(e) {
            const { datestr } = e.currentTarget.dataset;
            console.log("aaaaaaaa:", eptimes.outTime(new Date(datestr), 'yyyy/MM/dd HH:mm:ss'));
            const { currentDate } = this.data;
            let timeStr = eptimes.outTime(new Date(currentDate), 'yyyy/MM/dd HH:mm:ss');
            this.setData({
                myValue: timeStr,
                popShow: false
            })
            this.triggerEvent('setValue', this.data.myValue);
        }
    }
})

其中，onChang函数里面setData后获取到的currentData属性值是最新的，但是页面里面data-datestr属性currentDate和handleOK 里面取出的this.data.currentDate始终为上一次的结果。这个算是组件bug还是小程序数据绑定产生的bug呢？尝试了很多种情况setData与this.data数据都无法同步