Dart Flutter Converting timestamp

Question

I couldn t find a solution to this  I m grabbing data from firebase and one of the fields is a timestamp which looks like this -  1522129071  How to convert it to a date   Swift example  works     func readTimestamp timestamp  Int        let now   Date       let dateFormatter   DateFormatter       let date   Date timeIntervalSince1970  Double timestamp       let components   Set lt Calendar Component gt    second   minute   hour   day   weekOfMonth       let diff   Calendar current dateComponents components  from  date  to  now      var timeText           dateFormatter locale    current     dateFormatter dateFormat    HH mm a       if diff second   lt   0    diff second   gt  0  amp  amp  diff minute     0    diff minute   gt  0  amp  amp  diff hour     0    diff hour   gt  0  amp  amp  diff day     0           timeText   dateFormatter string from  date            if diff day   gt  0  amp  amp  diff weekOfMonth     0           timeText    diff day    1       diff day   DAY AGO       diff day   DAYS AGO            if diff weekOfMonth   gt  0           timeText    diff weekOfMonth    1       diff weekOfMonth   WEEK AGO       diff weekOfMonth   WEEKS AGO             return timeText     My attempt at Dart   String readTimestamp int timestamp        var now   new DateTime now        var format   new DateFormat  HH mm a        var date   new DateTime fromMicrosecondsSinceEpoch timestamp       var diff   date difference now       var time            if  diff inSeconds  lt   0    diff inSeconds  gt  0  amp  amp  diff inMinutes    0    diff inMinutes  gt  0  amp  amp  diff inHours    0    diff inHours  gt  0  amp  amp  diff inDays    0          time   format format date      Doesn t get called when it should be       else         time   diff inDays toString      DAYS AGO      Gets call and it s wrong date            return time      And it returns dates times that are waaaaaaay off   UPDATE   String readTimestamp int timestamp        var now   new DateTime now        var format   new DateFormat  HH mm a        var date   new DateTime fromMicrosecondsSinceEpoch timestamp   1000       var diff   date difference now       var time            if  diff inSeconds  lt   0    diff inSeconds  gt  0  amp  amp  diff inMinutes    0    diff inMinutes  gt  0  amp  amp  diff inHours    0    diff inHours  gt  0  amp  amp  diff inDays    0          time   format format date         else         if  diff inDays    1            time   diff inDays toString      DAY AGO           else           time   diff inDays toString      DAYS AGO                      return time

User · Answer

meh  just use https   github com andresaraujo timeago dart library  it does all the heavy-lifting for you    EDIT   From your question  it seems you wanted relative time conversions  and the timeago library enables you to do this in 1 line of code  Converting Dates isn t something I d choose to implement myself  as there are a lot of edge cases  amp  it gets fugly quickly  especially if you need to support different locales in the future   More code you write   more you have to test   import  package timeago timeago dart  as timeago   final fifteenAgo   DateTime now   subtract new Duration minutes  15    print timeago format fifteenAgo       15 minutes ago print timeago format fifteenAgo  locale   en short        15m print timeago format fifteenAgo  locale   es         Add a new locale messages timeago setLocaleMessages  fr   timeago FrMessages         Override a locale message timeago setLocaleMessages  en   CustomMessages      print timeago format fifteenAgo       15 min ago print timeago format fifteenAgo  locale   fr        environ 15 minutes   to convert epochMS to DateTime  just use     final DateTime timeStamp   DateTime fromMillisecondsSinceEpoch 1546553448639

User · Answer

I tested this one and it works    Map from firestore    Using flutterfire package hence the returned data   Map lt String  dynamic gt  data   documentSnapshot data    DateTime  timestamp   data  timestamp   toDate     Test details can be found here  https   www youtube com watch v W X8J7uBPNw amp feature youtu be

User · Answer

If you are using firestore  and not just storing the timestamp as a string  a date field in a document will return a Timestamp  The Timestamp object contains a toDate   method   Using timeago you can create a relative time quite simply    ago Timestamp t      return timeago format t toDate     en short       build       return  Text  ago document  mytimestamp           Make sure to set  firestore settings timestampsInSnapshotsEnabled  true   to return a Timestamp instead of a Date object

User · Answer

To convert Firestore Timestamp to DateTime object just use  toDate   method  Example  Timestamp now   Timestamp now    DateTime dateNow   now toDate     As you can see in docs

User · Answer

You can use intl package  first import  import  package intl intl dart     And then   int timeInMillis   1586348737122  var date   DateTime fromMillisecondsSinceEpoch timeInMillis   var formattedDate   DateFormat yMMMd   format date      Apr 8  2020

User · Answer

Just make sure to multiply by the right factor  Micro  multiply by 1000000  which is 10 power 6  Milli  multiply by 1000  which is 10 power 3  This is what it should look like in Dart  var date   new DateTime fromMicrosecondsSinceEpoch timestamp   1000000    Or var date   new DateTime fromMillisecondsSinceEpoch timestamp   1000

User · Answer

All of that above can work but for a quick and easy fix you can use the time formatter package  Using this package you can convert the epoch to human-readable time  String convertTimeStamp timeStamp     Pass the epoch server time and the it will format it for you     String formatted   formatTime timeStamp  toString       return formatted      Then you can display it Text convertTimeStamp  createdTimeStamp      lt  1 second    quot Just now quot  up to  lt  730 days    quot 1 year quot   Here you can check the format of the output that is going to be displayed  Formats

User · Answer

How to implement  import  package intl intl dart    getCustomFormattedDateTime String givenDateTime  String dateFormat           dateFormat    MM dd yy       final DateTime docDateTime   DateTime parse givenDateTime       return DateFormat dateFormat  format docDateTime      How to call  getCustomFormattedDateTime  2021-02-15T18 42 49 608466Z    MM dd yy     Result  02 15 21 Above code solved my problem  I hope  this will also help you  Thanks for asking this question

User · Answer

I don t know if this will help anyone  The previous messages have helped me so I m here to suggest a few things  import  package intl intl dart        DateTime convertTimeStampToDateTime int timeStamp         var dateToTimeStamp   DateTime fromMillisecondsSinceEpoch timeStamp   1000        return dateToTimeStamp          String convertTimeStampToHumanDate int timeStamp        var dateToTimeStamp   DateTime fromMillisecondsSinceEpoch timeStamp   1000       return DateFormat  dd MM yyyy   format dateToTimeStamp           String convertTimeStampToHumanHour int timeStamp         var dateToTimeStamp   DateTime fromMillisecondsSinceEpoch timeStamp   1000        return DateFormat  HH mm   format dateToTimeStamp            int constructDateAndHourRdvToTimeStamp DateTime dateTime  TimeOfDay time          final constructDateTimeRdv   dateTimeToTimeStamp DateTime dateTime year  dateTime month  dateTime day  time hour  time minute          return constructDateTimeRdv

User · Answer

Your timestamp format is in fact in Seconds  Unix timestamp  as opposed to microseconds  If so the answer is as follows  Change  var date   new DateTime fromMicrosecondsSinceEpoch timestamp    to var date   DateTime fromMillisecondsSinceEpoch timestamp   1000

User · Answer

Full code for anyone who needs it   String readTimestamp int timestamp        var now   DateTime now        var format   DateFormat  HH mm a        var date   DateTime fromMillisecondsSinceEpoch timestamp   1000       var diff   now difference date       var time            if  diff inSeconds  lt   0    diff inSeconds  gt  0  amp  amp  diff inMinutes    0    diff inMinutes  gt  0  amp  amp  diff inHours    0    diff inHours  gt  0  amp  amp  diff inDays    0          time   format format date         else if  diff inDays  gt  0  amp  amp  diff inDays  lt  7          if  diff inDays    1            time   diff inDays toString       DAY AGO           else           time   diff inDays toString       DAYS AGO                 else         if  diff inDays    7            time    diff inDays   7  floor   toString       WEEK AGO           else            time    diff inDays   7  floor   toString       WEEKS AGO                      return time        Thank you Alex Haslam for the help

User · Answer

Assuming the field in timestamp firestore is called timestamp  in dart you could call the toDate   method on the returned map     Map from firestore    Using flutterfire package hence the returned data   Map lt String  dynamic gt  data   documentSnapshot data    DateTime  timestamp   data  timestamp   toDate

User · Answer

If you are here to just convert Timestamp into DateTime  Timestamp timestamp   widget firebaseDocument timeStampfield   DateTime date   Timestamp fromMillisecondsSinceEpoch                  timestamp millisecondsSinceEpoch  toDate

User · Answer

if anyone come here to convert firebase Timestamp here this will help Timestamp time  DateTime fromMicrosecondsSinceEpoch time microsecondsSinceEpoch

[dart] Dart/Flutter : Converting timestamp

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