Angular / Firestore - Adding a formatted timestamp to a string field

Question

I'm writing a new document to Firestore. One of the fields must have some text, followed by the date, formatted like so 10/11/2020, 13:07. What would be the simplest way to achieve this? I have an exceptionally convoluted way of achieving this with Moment.js in an old project. But I would like to see if there's a more elegant approach.

this.doc.set({
  title: "A New Title " + ,
  date: firebase.firestore.FieldValue.serverTimestamp(),
})

In the above snippet, the title would need to be something like title: "My New Title " + date" so that the final result is something like: My New Title - 10/11/2020, 13:07

Apologies Frank. I was away for a few days. Updated. I'll respond to your post too. — user8836786
– user8836786, Commented Nov 13, 2020 at 9:28

Frank van Puffelen · Accepted Answer · 2020-11-10 14:15:16Z

0

There is no way to merge a server-side timestamp with another value in a single write.

You will either have to:

Use a client-side date/time in the title.
Use an extra operation to read back the server-side data, and add it to the title.
Keep the date as a separate field (like you have now), and add it to the title whenever read read the document.

answered Nov 10, 2020 at 14:15

Frank van Puffelen

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1 Comment

user8836786 Over a year ago

Thanks Frank. I appreciate the time. I just need to find an elegant way to achieve that.

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