How to print Firestore timestamp as formatted date and time

Question

My timestamp returns Timestamp(seconds=1560523991, nanoseconds=286000000) in a Flutter Firestore snapshot.

I want to print it as properly formatted date and time.

I'm using DateTime.now() to store current DateTime in Firestore while creating new records and retrieving it using Firestore snapshot but I am not able to convert to into formatted date time. I'm using lib intl.dart for formatting.

Code for saving data

       d={'amount':amount,       'desc':desc,       'user_id':user_id,       'flie_ref':url.toString(),       'date':'${user_id}${DateTime.now().day}-${DateTime.now().month}-${DateTime.now().year}',       'timestamp':DateTime.now() return Firestore.instance.collection('/data').add(d).then((v){return true;     }).catchError((onError)=>print(onError));     });  Accessing with       FutureBuilder(                   future: Firestore.instance                       .collection('data')                       .where('user_id', isEqualTo:_user_id)                       .getDocuments(),                   builder: (BuildContext context,                       AsyncSnapshot<QuerySnapshot> snapshot) {                     if (!snapshot.hasData)                       return Container(                           child: Center(child: CircularProgressIndicator()));                     return ListView.builder(                         itemCount: snapshot.data.documents.length,                         itemBuilder: (BuildContext context, int index) {                           return Column(                             children: <Widget>[        Text(DateFormat.yMMMd().add_jm().format(DateTime.parse(snapshot.data.documents[index].data['timestamp'].toString())]);   .... 

Error thrown is

Invalid date format.

I'm expecting output is: 'Jan 17, 2019, 2:19 PM'

Answer 1

When we push the DateTime object to Firestore, it internally converts it to it's own timestamp object and stores it.

Method to convert it back to Datetime after fetching timestamp from Firestore:

Firestore's timestamp contains a method called toDate() which can be converted to String and then that String can be passed to DateTime's parse method to convert back to DateTime

DateTime.parse(timestamp.toDate().toString()) 

Answer 2

Here is way!

Firestore will return TimeStamp like Timestamp(seconds=1560523991, nanoseconds=286000000).

This can be parsed as

Timestamp t = document['timeFieldName']; DateTime d = t.toDate(); print(d.toString()); //2019-12-28 18:48:48.364