How to recover the time (HH: MM) timestamp stored in Cloud Firestore?

Question

I have a problem I am saving a datetime with:

created_at: firebase.firestore.FieldValue.serverTimestamp(),

I'm trying to retrieve the time, by reading each doc:

renderMensaje: function(msj) {
var date = new Date(msj.data().created_at * 1000);
// Hours part from the timestamp
var hours = date.getHours();
// Minutes part from the timestamp
var minutes = date.getMinutes();
date = hours + ":" + minutes;
// ...

But, it doesn't work right.

console.log(date); // => Wed Dec 31 1969 18:00:00 GMT-0600 (hora estándar central)

console.log(msj.data().created_at); 
// => Timestamp(seconds=1535222867, nanoseconds=351000000)

How can I get the time (HH:MM)?

Please mention what is it that is not working? Read https://stackoverflow.com/help/how-to-ask for more points — nkshio, Aug 25 '18 at 19:47
Looks like an Unix-timestamp. You can parse it into a Date object and from that get hours/minutes: https://stackoverflow.com/a/847196/7362396 — Tobias K., Aug 25 '18 at 19:49

nkshio · Answer 1 · 2018-08-26T00:11:55.263

0

Issue - Firestore returns a Timestamp object

Resolution - Convert msj.data().created_at to JS Date object using toDate()

Code Snippet

renderMensaje: function(msj) {
    var date = msj.data().created_at.toDate();

    // Hours part from the timestamp
    var hours = date.getHours();

    // Minutes part from the timestamp
    var minutes = date.getMinutes();

    date = hours + ":" + minutes;
}

Also, check MomentJs. It is a lightweight, simple date library for parsing, manipulating, and formatting dates.

edited Aug 26 '18 at 00:11

answered Aug 25 '18 at 19:57

nkshio

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Something is wrong: console.log(date); // => Wed Dec 31 1969 18:00:00 GMT-0600 (hora estándar central) – David Betancourt M. Aug 25 '18 at 20:23
This would be the result of `new Date(your_timestamp)`, use prototype functions on the `date` object as mentioned above. – nkshio Aug 25 '18 at 20:47
`created_at` is a Timestamp object, not a number. – Doug Stevenson Aug 25 '18 at 21:38

score 0 · Answer 2 · answered Aug 25 '18 at 21:37

0

Firestore stores dates in documents as a Timestamp type object. If you want to get a Date object from a timestamp field in the document, you'll have to use its toDate() method to convert it.

answered Aug 25 '18 at 21:37

Doug Stevenson

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How to recover the time (HH: MM) timestamp stored in Cloud Firestore?

2 Answers2