entityMap|blocks|key|bvnob|text|Firebase.ServerValue.TIMESTAMP|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2qvm5|不是实际的时间戳，它是一个常量，如果你将它设置为某个变量，它将被服务器中的实际值所取代。|5b2vn|mySessionRef.update({+startedAt:+Firebase.ServerValue.TIMESTAMP+});
mySessionRef.on('value',+function(snapshot){+console.log(snapshot.val())+})
//{startedAt:+1452508763895}|code-block|syntax|javascript|ftu9n|如果您想获得服务器时间，那么可以使用以下代码|42bj8|fb.ref("/.info/serverTimeOffset").on('value',+function(offset)+{
++++var+offsetVal+=+offset.val()+%7C%7C+0;
++++var+serverTime+=+Date.now()+%2B+offsetVal;
++});^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|N|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|O|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|P|9|@]|A|@]|B|$H|I]]|$2|J|4|K|6|7|8|Q|9|@]|A|@]|B|$]]|$2|L|4|M|6|G|8|R|9|@]|A|@]|B|$H|I]]]]

<a href="https://www.firebase.com/docs/web/api/servervalue/timestamp.html" rel="noreferrer">Firebase.ServerValue.TIMESTAMP</a> is not actual timestamp it is constant that will be replaced with actual value in server if you have it set into some variable.

<pre><code>mySessionRef.update({ startedAt: Firebase.ServerValue.TIMESTAMP });
mySessionRef.on('value', function(snapshot){ console.log(snapshot.val()) })
//{startedAt: 1452508763895}
</code></pre>

if you want to get server time then you can use following code

<pre><code> fb.ref("/.info/serverTimeOffset").on('value', function(offset) {
 var offsetVal = offset.val() || 0;
 var serverTime = Date.now() + offsetVal;
 });
</code></pre>

entityMap|blocks|key|ba43v|text|时间戳是一个对象|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2hl8f|​|d9ou|timestamp=+{nanoseconds:+0,
seconds:+1562524200}

console.log(new+Date(timestamp.seconds*1000))|code-block|syntax|javascript|326d5^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|M|9|@]|A|@]|B|$H|I]]|$2|J|4|D|6|7|8|N|9|@]|A|@]|B|$]]]]

timestamp is an object

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>timestamp= {nanoseconds: 0,
seconds: 1562524200}

console.log(new Date(timestamp.seconds*1000))</code></pre>
</div>
</div>

entityMap|blocks|key|1t0j8|text|事实上，它只在我使用时才起作用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5l2d3|firebase.database.ServerValue.TIMESTAMP|code-block|syntax|javascript|9bja|在命名空间上多了一个“数据库”。^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|K|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|L|9|@]|A|@]|B|$]]]]

In fact, it only work to me when used

<pre><code>firebase.database.ServerValue.TIMESTAMP
</code></pre>

With one 'database' more on namespace.

entityMap|blocks|key|4k2dp|text|在Firebase函数内部，转换时间戳的方式如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|870d6|timestampObj.toDate()
timestampObj.toMillis().toString()|code-block|syntax|javascript|ahkqr|此处的文档|fsl5h|https://firebase.google.com/docs/reference/js/firebase.firestore.Timestamp^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|M|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|N|9|@]|A|@]|B|$]]|$2|J|4|K|6|7|8|O|9|@]|A|@]|B|$]]]]

inside Firebase Functions transform the timestamp like so: 

<pre><code>timestampObj.toDate()
timestampObj.toMillis().toString()
</code></pre>

documentation here <a href="https://firebase.google.com/docs/reference/js/firebase.firestore.Timestamp" rel="noreferrer">https://firebase.google.com/docs/reference/js/firebase.firestore.Timestamp</a>

entityMap|blocks|key|3jbko|text|对于那些正在寻找Firebase的人|type|unstyled|depth|inlineStyleRanges|entityRanges|data|c3i3e|Firestore|8708c|等效。这是|6lcqu|firebase.firestore.FieldValue.serverTimestamp()|code-block|syntax|javascript|8f0rg|例如：|fv5v0|firebase.firestore().collection("cities").add({
++++createdAt:+firebase.firestore.FieldValue.serverTimestamp(),
++++name:+"Tokyo",
++++country:+"Japan"
})
.then(function(docRef)+{
++++console.log("Document+written+with+ID:+",+docRef.id);
})
.catch(function(error)+{
++++console.error("Error+adding+document:+",+error);
});|ef877|文档^0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|R|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|S|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|T|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|U|9|@]|A|@]|B|$J|K]]|$2|L|4|M|6|7|8|V|9|@]|A|@]|B|$]]|$2|N|4|O|6|I|8|W|9|@]|A|@]|B|$J|K]]|$2|P|4|Q|6|7|8|X|9|@]|A|@]|B|$]]]]

For those looking for the Firebase <a href="https://firebase.google.com/docs/firestore/" rel="noreferrer">Firestore</a> equivalent. It's

<pre><code>firebase.firestore.FieldValue.serverTimestamp()
</code></pre>

e.g.

<pre><code>firebase.firestore().collection("cities").add({
 createdAt: firebase.firestore.FieldValue.serverTimestamp(),
 name: "Tokyo",
 country: "Japan"
})
.then(function(docRef) {
 console.log("Document written with ID: ", docRef.id);
})
.catch(function(error) {
 console.error("Error adding document: ", error);
});
</code></pre>

<a href="https://firebase.google.com/docs/reference/js/firebase.firestore.FieldValue" rel="noreferrer">Docs</a>

entityMap|blocks|key|craqi|text|针对更新版本的Firebase的解决方案(2016年1月之后)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|10np0|将时间戳附加到数据库更新的正确方法是在请求中附加占位符值。在下面的示例中，Firebase将替换|ia6o|带有时间戳的属性：|bn47o|firebaseRef+=+firebase.database().ref();
firebaseRef.set({
++foo:+"bar",+
++createdAt:+firebase.database.ServerValue.TIMESTAMP
});|code-block|syntax|javascript|7os59|根据|89uca|文档|19keh|，值|598l2|是：“Firebase数据库服务器自动填充当前时间戳(自Unix时代以来的时间，以毫秒为单位)的占位符数值。”^0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|T|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|U|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|V|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|W|9|@]|A|@]|B|$J|K]]|$2|L|4|M|6|7|8|X|9|@]|A|@]|B|$]]|$2|N|4|O|6|7|8|Y|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|Z|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|10|9|@]|A|@]|B|$]]]]

<h3>Solution for newer versions of Firebase (after Jan 2016)</h3>

The proper way to attach a timestamp to a database update is to attach a placeholder value in your request. In the example below Firebase will replace the <code>createdAt</code> property with a timestamp: 

<pre><code>firebaseRef = firebase.database().ref();
firebaseRef.set({
 foo: "bar", 
 createdAt: firebase.database.ServerValue.TIMESTAMP
});
</code></pre>

According to the <a href="https://firebase.google.com/docs/reference/android/com/google/firebase/database/ServerValue" rel="noreferrer">documentation</a>, the value <code>firebase.database.ServerValue.TIMESTAMP</code> is: "A placeholder value for auto-populating the current timestamp (time since the Unix epoch, in milliseconds) by the Firebase Database servers."

entityMap|blocks|key|nr2q|text|对于Firestore，这是Google的新一代数据库，下面的代码将简单地帮助您解决这个问题。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6r65o|var+admin++++=+require("firebase-admin");

var+serviceAccount+=+require("../admin-sdk.json");+//+auto-generated+file+from+Google+firebase.

admin.initializeApp({
++credential:+admin.credential.cert(serviceAccount)
});
var+db+=+admin.firestore();

console.log(admin.firestore.Timestamp.now().toDate());|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

For Firestore that is the new generation of database from Google, following code will simply help you through this problem.

<pre><code>var admin = require("firebase-admin");

var serviceAccount = require("../admin-sdk.json"); // auto-generated file from Google firebase.

admin.initializeApp({
 credential: admin.credential.cert(serviceAccount)
});
var db = admin.firestore();

console.log(admin.firestore.Timestamp.now().toDate());
</code></pre>

entityMap|blocks|key|2o7i8|text|使用Firebase+Firestone+18.0.1+(com.google.firebase.Timestamp)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6t2v0|val+timestamp+=+(document.data["timestamp"]+as+Timestamp).toDate()|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

Working with Firebase Firestone 18.0.1
(com.google.firebase.Timestamp)

<pre><code>val timestamp = (document.data["timestamp"] as Timestamp).toDate()
</code></pre>

entityMap|blocks|key|cd640|text|我知道火场给出了时间戳|type|unstyled|depth|inlineStyleRanges|entityRanges|data|6l0cd|要转换为日期，您只需执行以下操作：|6el7g|在一个变量中获取一个火基时间，例如：-+const+date|fvhhj|然后|ct751|=>它返回日期。^0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|K|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|L|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|M|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|N|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|O|9|@]|A|@]|B|$]]]]

I know the firebase give the timestamp in <code>{seconds: '', and nanoseconds: ''}</code>
for converting into date u have to only do:
<ul>
<li>take a firebase time in one var ex:- const date</li>
</ul>
and then <code>date.toDate()</code> =&gt; It returns the date.

entityMap|blocks|key|f3q8e|text|这很简单。使用该函数获取以毫秒为单位的服务器时间戳|type|unstyled|depth|inlineStyleRanges|entityRanges|data|f2k0u|只有一次|1klkd|var+getServerTime+=+function(+cb+)+{
++++this.db.ref(+'.info/serverTimeOffset'+).once(+'value',+function(+snap+)+{
++++++var+offset+=+snap.val();

++++++//+Get+server+time+by+milliseconds
++++++cb(+new+Date().getTime()+%2B+offset+);
++++});
};|code-block|syntax|javascript|48cn9|现在你可以像这样在任何地方使用它：|ajhll|getServerTime(+function(+now+)+{
++++console.log(+now+);
});|doboa|为什么要用这种方式呢？|d5ij|根据最新的Firebase文档，您应该将Firebase时间戳转换为毫秒。所以你可以使用|86b0e|以下变量：|cd3oa|var+offsetRef+=+firebase.database().ref(".info/serverTimeOffset");
offsetRef.on("value",+function(snap)+{
++var+offset+=+snap.val();
++var+estimatedServerTimeMs+=+new+Date().getTime()+%2B+offset;
});|6qbjh|虽然firebase.database.ServerValue.TIMESTAMP要精确得多，并且对于大多数读/写操作是首选的，但它有时也可以用于估计客户端相对于Firebase实时数据库的服务器的时钟偏差。您可以将回调附加到位置/.info/serverTimeOffset，以获取Firebase实时数据库客户端添加到本地报告时间(以毫秒为单位的纪元时间)以估计服务器时间的值(以毫秒为单位)。请注意，此偏移量的准确性可能会受到网络延迟的影响，因此主要用于发现时钟时间中的较大(>+1秒)差异。|e1jn7|efs7j|https://firebase.google.com/docs/database/web/offline-capabilities^0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|10|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|11|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|12|9|@]|A|@]|B|$H|I]]|$2|J|4|K|6|7|8|13|9|@]|A|@]|B|$]]|$2|L|4|M|6|G|8|14|9|@]|A|@]|B|$H|I]]|$2|N|4|O|6|7|8|15|9|@]|A|@]|B|$]]|$2|P|4|Q|6|7|8|16|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|17|9|@]|A|@]|B|$]]|$2|T|4|U|6|G|8|18|9|@]|A|@]|B|$H|I]]|$2|V|4|W|6|7|8|19|9|@]|A|@]|B|$]]|$2|X|4|-4|6|7|8|1A|9|@]|A|@]|B|$]]|$2|Y|4|Z|6|7|8|1B|9|@]|A|@]|B|$]]]]

It is simple. Use that function to get server timestamp as milliseconds one time only:

<pre><code>var getServerTime = function( cb ) {
 this.db.ref( '.info/serverTimeOffset' ).once( 'value', function( snap ) {
 var offset = snap.val();

 // Get server time by milliseconds
 cb( new Date().getTime() + offset );
 });
};
</code></pre>

Now you can use it anywhere like that:

<pre><code>getServerTime( function( now ) {
 console.log( now );
});
</code></pre>

<hr>

<h2>Why use this way?</h2>

According to latest Firebase documentation, you should convert your Firebase timestamp into milliseconds. So you can use <code>estimatedServerTimeMs</code> variable below:

<pre><code>var offsetRef = firebase.database().ref(".info/serverTimeOffset");
offsetRef.on("value", function(snap) {
 var offset = snap.val();
 var estimatedServerTimeMs = new Date().getTime() + offset;
});
</code></pre>

<blockquote>
 While firebase.database.ServerValue.TIMESTAMP is much more accurate,
 and preferable for most read/write operations, it can occasionally be
 useful to estimate the client's clock skew with respect to the
 Firebase Realtime Database's servers. You can attach a callback to the
 location /.info/serverTimeOffset to obtain the value, in milliseconds,
 that Firebase Realtime Database clients add to the local reported time
 (epoch time in milliseconds) to estimate the server time. Note that
 this offset's accuracy can be affected by networking latency, and so
 is useful primarily for discovering large (> 1 second) discrepancies
 in clock time.
</blockquote>

<a href="https://firebase.google.com/docs/database/web/offline-capabilities" rel="nofollow noreferrer">https://firebase.google.com/docs/database/web/offline-capabilities</a>

entityMap|blocks|key|cvpa9|text|下面是一个安全的方法，可以将值从firebase+Timestamp类型转换为JS+Date，以防该值不是Timestamp，该方法会按原样返回该值|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4dcnq|适用于Angular+7/8/9|9djia|import+firebase+from+'firebase';
import+Timestamp+=+firebase.firestore.Timestamp;

export+function+convertTimestampToDate(timestamp:+Timestamp+%7C+any):+Date+%7C+any+{
++return+timestamp+instanceof+Timestamp
++++?+new+Timestamp(timestamp.seconds,+timestamp.nanoseconds).toDate()
++++:+timestamp;
}|code-block|syntax|javascript^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|J|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|K|9|@]|A|@]|B|$]]|$2|E|4|F|6|G|8|L|9|@]|A|@]|B|$H|I]]]]

Here is a safe method to convert a value from firebase Timestamp type to JS Date
in case the value is not Timestamp the method returns it as it is

Works for Angular 7/8/9

<pre><code>import firebase from 'firebase';
import Timestamp = firebase.firestore.Timestamp;

export function convertTimestampToDate(timestamp: Timestamp | any): Date | any {
 return timestamp instanceof Timestamp
 ? new Timestamp(timestamp.seconds, timestamp.nanoseconds).toDate()
 : timestamp;
}
</code></pre>

entityMap|blocks|key|c24rm|text|试试这个，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2qqik|var+timestamp+=+firebase.firestore.FieldValue.serverTimestamp()
var+timestamp2+=+new+Date(timestamp.toDate()).toUTCString()|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

Try this one,
<pre><code>var timestamp = firebase.firestore.FieldValue.serverTimestamp()
var timestamp2 = new Date(timestamp.toDate()).toUTCString()
</code></pre>

entityMap|blocks|key|b4c50|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|87ktk|var+date+=+new+Date((1578316263249));//data[k].timestamp
console.log(date);|code-block|syntax|javascript|cfnd8^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|5|6|7|8|K|9|@]|A|@]|B|$]]]]

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>var date = new Date((1578316263249));//data[k].timestamp
console.log(date);</code></pre>
</div>
</div>

entityMap|blocks|key|f23qu|text|遍历这段代码就是为我工作的精确代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1nnb9|querySnapshot.docs.forEach((e)+=>+{
+++var+readableDate+=+e.data().date.toDate();
+++console.log(readableDate);
}|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

Iterating through this is the precise code that worked for me.

<pre><code>querySnapshot.docs.forEach((e) =&gt; {
 var readableDate = e.data().date.toDate();
 console.log(readableDate);
}

</code></pre>

entityMap|blocks|key|c6f|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data^0^^$0|$]|1|@$2|3|4|-4|5|6|7|B|8|@]|9|@]|A|$]]]]

<code>new Date(timestamp.toDate()).toUTCString()</code>

entityMap|blocks|key|7l8fe|text|我转换成这种格式|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2lo7u|let+timestamp+=+'1452488445471';
let+newDate+=+new+Date(timestamp+*+1000)
let+Hours+=+newDate.getHours()
let+Minutes+=+newDate.getMinutes()
const+HourComplete+=+Hours+%2B+':'+%2B+Minutes
let+formatedTime+=+HourComplete
console.log(formatedTime)|code-block|syntax|javascript^0|0^^$0|$]|1|@$2|3|4|5|6|7|8|H|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|I|9|@]|A|@]|B|$F|G]]]]

I converted to this format
<pre><code>let timestamp = '1452488445471';
let newDate = new Date(timestamp * 1000)
let Hours = newDate.getHours()
let Minutes = newDate.getMinutes()
const HourComplete = Hours + ':' + Minutes
let formatedTime = HourComplete
console.log(formatedTime)
</code></pre>

entityMap|blocks|key|euduf|text|import+firebaseAPP+from+'firebase/app';


++++public+Date2firestoreTime(fromDate:+Date)+{
+++++++return+firebaseAPP.firestore.Timestamp.fromDate(fromDate).toMillis()
++++}
++++public+firestoreTime2Date(millisecDate:+number)+{
+++++++return+firebaseAPP.firestore.Timestamp.fromMillis(millisecDate).toDate()
++++}


++++//usage:
++++let+FSdatenow+=+this.Date2firestoreTime(new+Date())
++++console.log('now+to+firestore+TimeStamp',+FSdatenow)
++++let+JSdatenow+=+this.firestoreTime2Date(FSdatenow)
++++console.log('firestore+TimeStamp+to+Date+Obj',+JSdatenow)|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript^0^^$0|$]|1|@$2|3|4|5|6|7|8|E|9|@]|A|@]|B|$C|D]]]]

<pre><code> import firebaseAPP from 'firebase/app';


 public Date2firestoreTime(fromDate: Date) {
 return firebaseAPP.firestore.Timestamp.fromDate(fromDate).toMillis()
 }
 public firestoreTime2Date(millisecDate: number) {
 return firebaseAPP.firestore.Timestamp.fromMillis(millisecDate).toDate()
 }


 //usage:
 let FSdatenow = this.Date2firestoreTime(new Date())
 console.log('now to firestore TimeStamp', FSdatenow)
 let JSdatenow = this.firestoreTime2Date(FSdatenow)
 console.log('firestore TimeStamp to Date Obj', JSdatenow)
</code></pre>

entityMap|blocks|key|268d4|text|首先|type|unstyled|depth|inlineStyleRanges|entityRanges|data|a2pb0|对我来说已经不起作用了。|eg3f5|因此，要添加时间戳，您必须使用|dmpub|时间戳是长毫秒的format.To将毫秒转换为简单的日期格式。|1q50s|Ex-+dd/MM/yy+HH:mm:ss|95tjl|您可以在java中使用以下代码：|dk6fd|从firebase数据库获取字符串形式的时间戳值|aogs6|String+x+=+dataSnapshot.getValue+(String.class);|code-block|syntax|javascript|6cf21|数据现在是字符串形式。您可以将|102lg|至|dvsnk|long+milliSeconds=+Long.parseLong(x);|4jmu7|然后创建SimpleDateFormat|2f9l9|SimpleDateFormat+sdf+=+new+SimpleDateFormat("dd/MM/yy+HH:mm:ss");|d4f7f|现在将毫秒时间戳转换为您的sdf格式|dbfru|String+dateAsString+=+sdf.format+(milliSeconds);|4ttka|在此之后，您可以将其解析为您的|bg7a6|变量|5gope|date+=+sdf.parse+(dateAsString);^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|1D|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|1E|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|1F|9|@]|A|@]|B|$]]|$2|G|4|H|6|7|8|1G|9|@]|A|@]|B|$]]|$2|I|4|J|6|7|8|1H|9|@]|A|@]|B|$]]|$2|K|4|L|6|7|8|1I|9|@]|A|@]|B|$]]|$2|M|4|N|6|7|8|1J|9|@]|A|@]|B|$]]|$2|O|4|P|6|Q|8|1K|9|@]|A|@]|B|$R|S]]|$2|T|4|U|6|7|8|1L|9|@]|A|@]|B|$]]|$2|V|4|W|6|7|8|1M|9|@]|A|@]|B|$]]|$2|X|4|Y|6|Q|8|1N|9|@]|A|@]|B|$R|S]]|$2|Z|4|10|6|7|8|1O|9|@]|A|@]|B|$]]|$2|11|4|12|6|Q|8|1P|9|@]|A|@]|B|$R|S]]|$2|13|4|14|6|7|8|1Q|9|@]|A|@]|B|$]]|$2|15|4|16|6|Q|8|1R|9|@]|A|@]|B|$R|S]]|$2|17|4|18|6|7|8|1S|9|@]|A|@]|B|$]]|$2|19|4|1A|6|7|8|1T|9|@]|A|@]|B|$]]|$2|1B|4|1C|6|Q|8|1U|9|@]|A|@]|B|$R|S]]]]

First Of All <code>Firebase.ServerValue.TIMESTAMP</code> is not working anymore for me.

So for adding timestamp you have to use <code>Firebase.database.ServerValue.TIMESTAMP</code>

And the timestamp is in long millisecond format.To convert millisecond to simple dateformat . 

Ex- dd/MM/yy HH:mm:ss

You can use the following code in java:

To get the timestamp value in string from the firebase database

<pre><code>String x = dataSnapshot.getValue (String.class);
</code></pre>

The data is in string now. You can convert the <code>string</code> to <code>long</code>

<pre><code>long milliSeconds= Long.parseLong(x);
</code></pre>

Then create SimpleDateFormat

<pre><code>SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yy HH:mm:ss");
</code></pre>

Now convert your millisecond timestamp to ur sdf format

<pre><code>String dateAsString = sdf.format (milliSeconds);
</code></pre>

After that you can parse it to ur <code>Date</code> variable

<pre><code> date = sdf.parse (dateAsString);
</code></pre>

entityMap|0|type|IMAGE|mutability|IMMUTABLE|data|imageUrl|https://ask.qcloudimg.com/http-save/actteam/d538a32c6b3e6e52ab3581be5931c077.png|imageAlt|blocks|key|2psjc|text|这段代码很适合我|unstyled|depth|inlineStyleRanges|entityRanges|fegle|var+config+=+{
++++apiKey:+"",
++++authDomain:+"",
++++databaseURL:+"",
++++projectId:+"",
++++storageBucket:+"",
++++messagingSenderId:+""
};

firebase.initializeApp(config);
var+reff+=+firebase.database().ref('message');
reff.on('value',haveData,+haveerr);
function+haveData(datahave){
++++var+existval=+datahave.val();
++++var+chabi=Object.keys(existval);
++++for(var+d2=0;d2<+chabi.length;d2%2B%2B){
++++++++var+r=chabi[d2];
++++++++var+exitval=existval[r].Message;
++++++++var+exitval1=existval[r].Name;
++++++++var+exit=existval[r].Email;
++++++++var+exitval2=existval[r].Subject;
++++++++var+timestamp=existval[r].timestamp;
++++++++var+sdate=new+Date(timestamp);
++++++++var+Year=sdate.getFullYear();
++++++++var+month=sdate.getMonth()%2B1;
++++++++var+day=sdate.getDate();
++++++++var+hh=sdate.getHours();
++++++++var+mm=sdate.getMinutes();
++++++++var+ss=sdate.getSeconds();
++++}
}

function+haveerr(e){
+++++console.log(e);
}|code-block|syntax|javascript|2pe3n|​|1t70s|6cn8d|?|atomic|offset|length|bavcs|5bpal^0|0|0|0|0|0|1|0|0|0^^$0|$1|$2|3|4|5|6|$7|8|9|-4]]]|A|@$B|C|D|E|2|F|G|Y|H|@]|I|@]|6|$]]|$B|J|D|K|2|L|G|Z|H|@]|I|@]|6|$M|N]]|$B|O|D|P|2|F|G|10|H|@]|I|@]|6|$]]|$B|Q|D|-4|2|F|G|11|H|@]|I|@]|6|$]]|$B|R|D|S|2|T|G|12|H|@]|I|@$U|13|V|14|B|15]]|6|$]]|$B|W|D|-4|2|F|G|16|H|@]|I|@]|6|$]]|$B|X|D|P|2|F|G|17|H|@]|I|@]|6|$]]]]

This code is work for me

<pre><code>&lt;script src="https://www.gstatic.com/firebasejs/4.5.1/firebase.js"&gt;&lt;/script&gt;
&lt;script&gt;
var config = {
 apiKey: "",
 authDomain: "",
 databaseURL: "",
 projectId: "",
 storageBucket: "",
 messagingSenderId: ""
};

firebase.initializeApp(config);
var reff = firebase.database().ref('message');
reff.on('value',haveData, haveerr);
function haveData(datahave){
 var existval= datahave.val();
 var chabi=Object.keys(existval);
 for(var d2=0;d2&lt; chabi.length;d2++){
 var r=chabi[d2];
 var exitval=existval[r].Message;
 var exitval1=existval[r].Name;
 var exit=existval[r].Email;
 var exitval2=existval[r].Subject;
 var timestamp=existval[r].timestamp;
 var sdate=new Date(timestamp);
 var Year=sdate.getFullYear();
 var month=sdate.getMonth()+1;
 var day=sdate.getDate();
 var hh=sdate.getHours();
 var mm=sdate.getMinutes();
 var ss=sdate.getSeconds();
 }
}

function haveerr(e){
 console.log(e);
}
&lt;/script&gt;
</code></pre>

<img src="https://i.stack.imgur.com/cHayk.png" alt="firebase database">

entityMap|blocks|key|ttvp|text|与|type|unstyled|depth|inlineStyleRanges|entityRanges|data|9rrv1|..。|m4il|转换它：|fjlc9|var+timestamp+=+'1452488445471';
var+myDate+=+new+Date(timestamp).getTime();|code-block|syntax|javascript^0|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|L|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|M|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|N|9|@]|A|@]|B|$]]|$2|G|4|H|6|I|8|O|9|@]|A|@]|B|$J|K]]]]

<code>Firebase.ServerValue.TIMESTAMP</code> is the same as <code>new Date().getTime()</code>.

Convert it: 

<pre><code>var timestamp = '1452488445471';
var myDate = new Date(timestamp).getTime();
</code></pre>

I am using firebase for my chat application. In chat object I am adding time stamp using <code>Firebase.ServerValue.TIMESTAMP</code> method.

I need to show the message received time in my chat application using this Time stamp .

if it's current time i need to show the time only.It's have days difference i need to show the date and time or only date.

I used the following code for convert the Firebase time stamp but i not getting the actual time.

<pre><code>var timestamp = '1452488445471';
var myDate = new Date(timestamp*1000);
var formatedTime=myDate.toJSON();
</code></pre>

Please suggest the solution for this issue

Firebase TIMESTAMP to date and Time

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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 我正在为我的聊天应用程序使用firebase。在chat对象中，我使用以下命令添加时间戳 方法。 我需要使用此时间戳在我的聊天应用程序中显示收到消息的时间。 如果是当前时间，我只需要显示时间。如果有天差，我需要显示日期和时间，或者只显示日期。 我使用了下面的代码来转换Firebase时间戳，但是我没有得到实际的时间。 var timestamp = '1452488445471';var myD

问Firebase时间戳至日期和时间
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