如何将以前的时间戳保存到Firebase FireStore [英] How to save previous timestamp to Firebase FireStore

问题描述

我想将旧数据从其他系统迁移到Firestore.

I want to migrate the older data from different system to firestore.

下面的命令保存当前时间戳

below command saves current timestamp

firebase.firestore.FieldValue.serverTimestamp()

我想存储较早的值，有什么办法吗?

I want to store older values, Is there any way available?

推荐答案

firebase.firestore.FieldValue.serverTimestamp()是标记值，您可以在代码中使用该标记值，将当前服务器端时间戳记写入日期字段.如果要在日期字段中存储另一个值，则可以在写入时指定该值.

firebase.firestore.FieldValue.serverTimestamp() is a marker value you can use in your code to write the current server-side timestamp into a date field. If you want to store another value in a date field, you can specify the value when writing.

摘录自有关添加数据的Firebase文档 :

db.collection("data").doc("one").set({
    dateField: new Date("December 10, 1815"),
}).then(function() {
    console.log("Document successfully written!");
});

这篇关于如何将以前的时间戳保存到Firebase FireStore的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！