Firebase TIMESTAMP to date and Time

Question

I am using firebase for my chat application  In chat object I am adding time stamp using Firebase ServerValue TIMESTAMP 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   var timestamp    1452488445471   var myDate   new Date timestamp 1000   var formatedTime myDate toJSON      Please suggest the solution for this issue

User · Answer

Iterating through this is the precise code that worked for me   querySnapshot docs forEach  e    gt       var readableDate   e data   date toDate       console log readableDate

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Solution for newer versions of Firebase  after Jan 2016   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 createdAt property with a timestamp    firebaseRef   firebase database   ref    firebaseRef set     foo   bar      createdAt  firebase database ServerValue TIMESTAMP       According to the documentation  the value firebase database ServerValue TIMESTAMP is   A placeholder value for auto-populating the current timestamp  time since the Unix epoch  in milliseconds  by the Firebase Database servers

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I know the firebase give the timestamp in  seconds      and nanoseconds      for converting into date u have to only do   take a firebase time in one var ex - const date  and then date toDate     gt  It returns the date

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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  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

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Firebase ServerValue TIMESTAMP is not actual timestamp it is constant that will be replaced with actual value in server if you have it set into some variable   mySessionRef update   startedAt  Firebase ServerValue TIMESTAMP     mySessionRef on  value   function snapshot   console log snapshot val          startedAt  1452508763895    if you want to get server time then you can use following code    fb ref    info serverTimeOffset   on  value   function offset        var offsetVal   offset val      0      var serverTime   Date now     offsetVal

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new Date timestamp toDate    toUTCString

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First Of All Firebase ServerValue TIMESTAMP is not working anymore for me   So for adding timestamp you have to use Firebase database ServerValue TIMESTAMP  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  String x   dataSnapshot getValue  String class     The data is in string now  You can convert the string to long  long milliSeconds  Long parseLong x     Then create SimpleDateFormat  SimpleDateFormat sdf   new SimpleDateFormat  dd MM yy HH mm ss      Now convert your millisecond timestamp to ur sdf format  String dateAsString   sdf format  milliSeconds     After that you can parse it to ur Date variable   date   sdf parse  dateAsString

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It is simple  Use that function to get server timestamp as milliseconds one time only   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                 Now you can use it anywhere like that   getServerTime  function  now         console log  now            Why use this way   According to latest Firebase documentation  you should convert your Firebase timestamp into milliseconds  So you can use estimatedServerTimeMs variable below   var offsetRef   firebase database   ref   info serverTimeOffset    offsetRef on  value   function snap      var offset   snap val      var estimatedServerTimeMs   new Date   getTime     offset           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    https   firebase google com docs database web offline-capabilities

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This code is work for me   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

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I converted to this format 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

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In fact  it only work to me when used  firebase database ServerValue TIMESTAMP   With one  database  more on namespace

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Working with Firebase Firestone 18 0 1  com google firebase Timestamp   val timestamp    document data  timestamp   as Timestamp  toDate

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Try this one  var timestamp   firebase firestore FieldValue serverTimestamp   var timestamp2   new Date timestamp toDate    toUTCString

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For those looking for the Firebase Firestore equivalent  It s  firebase firestore FieldValue serverTimestamp     e g   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         Docs

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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

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timestamp is an object   x000D   x000D  timestamp   nanoseconds  0  x000D  seconds  1562524200  x000D   x000D  console log new Date timestamp seconds 1000   x000D   x000D   x000D

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x000D   x000D  var date   new Date  1578316263249     data k  timestamp x000D  console log date   x000D   x000D   x000D

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

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inside Firebase Functions transform the timestamp like so    timestampObj toDate   timestampObj toMillis   toString     documentation here https   firebase google com docs reference js firebase firestore Timestamp

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Firebase ServerValue TIMESTAMP is the same as new Date   getTime     Convert it      var timestamp    1452488445471   var myDate   new Date timestamp  getTime

[javascript] Firebase TIMESTAMP to date and Time

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