Question 120533 in Firebase Question posted in
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Firebase – Convert milliseconds to Firestore date

In Flutter I convert dates to milliseconds like this:

static DateTime createDateTimeNow() {
    return DateTime(DateTime.now().year, DateTime.now().month,
        DateTime.now().day, 0, 0, 0, 0, 0);
  }

// This create a number value like 1660341600000
final Number millisecondsNow = Helpers.createDateTimeNow().toUtc().millisecondsSinceEpoch;

// I can also format is as String to be presented based on the language
final String dateNow = DateFormat.yMMMMd(language).format(millisecondsNow);

Now I have Firebase Cloud Functions that should read these dates and send notification when they expire, but could I convert this number to a normal date in Firestore?

From Flutter I do something like this:

final DateTime dateNow = DateTime.fromMillisecondsSinceEpoch(1660341600000);
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2

Answers


  1. 0

    You’re working too hard. Firestore Timestamp to Dart DateTime:

    final dt = aTimestamp.toDate();

    and from DateTime to Timestamp:

    final ts = Timestamp.fromDate(aDt);

    as described in https://pub.dev/documentation/cloud_firestore_platform_interface/latest/cloud_firestore_platform_interface/Timestamp-class.html

    and there’s no need to think about "milliseconds".

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  2. 0

    You can use fromMillis( ) method from firestore.timestamp which can create new timestamp from the given number of milliseconds.

    firestore.Timestamp.fromMillis(milliseconds)

    You can refer these documents for more details firestore timestamp from milliseconds and Firestore Timestamp

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