var filter = {
  getDateTime: function (value) {
    //不能使用 new Date()
      var time = getDate(value);
      var year = time.getFullYear();
      var month = time.getMonth() + 1;
      var date = time.getDate();
      var hour = time.getHours();
      var minute = time.getMinutes();
      var second = time.getSeconds();
      month = month < 10 ? "0" + month : month;
      date = date < 10 ? "0" + date : date;
      hour = hour < 10 ? "0" + hour : hour;
      minute = minute < 10 ? "0" + minute : minute;
      second = second < 10 ? "0" + second : second;
      return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
  }
}
// 导出对外暴露的属性
module.exports = {
  getDateTime: filter.getDateTime
}

在.wxml中引入文件

在顶部引入：
<wxs module="filter" src="./func.wxs"></wxs>
使用：
<view>{{filter.getDateTime(时间戳)}}</view>

遇到了这么一个问题，就是后台给我的时间是2019-07-23T13:46:51.000+0000
然而ios不支持！！！
后来发现，可以转成Z结尾的value = value.replace(".000+0000","Z");
ios和android就都支持了。

<wxs module="a">
    var change = function(value) {
  value = value.replace(".000+0000","Z");
     var time = getDate(value);
    var year = time.getFullYear();
    var month = time.getMonth() + 1;
    var date = time.getDate();
    var hour = time.getHours();
    var minute = time.getMinutes();
    var second = time.getSeconds();
    month = month < 10 ? "0" + month : month;
    date = date < 10 ? "0" + date : date;
    hour = hour < 10 ? "0" + hour : hour;
    minute = minute < 10 ? "0" + minute : minute;
    second = second < 10 ? "0" + second : second;
    return year + "-" + month + "-" + date + " " + hour + ":" + minute + ":" + second;
    }
    module.exports.change = change
</wxs>
<view>{{a.change(time)}}</view>

 data: {
    // time:"2017-12-28T10:43:49Z"
    time:"2019-07-23T13:46:51.000+0000"
  },