Cloud Firestore How to subtract hour from Timestamp

Question

I am able to get the timestamp using this line in my index.js.

var now = admin.firestore.Timestamp.now();

I just want the timestamp that's 1 hour before now.

I've tried this and hasn't worked.

var old = now(now.seconds-1*60*60,milliseconds);

Also tried but it returns just the seconds instead of a timestamp

var old = admin.firestore.Timestamp.now().seconds - 1*60*60;

Any ideas on how to get the timestamp of an hour before?

Answer 1

Firestore's Timestamp class doesn't offer the ability to do "date math". You should do any date math using a native date type for your language, then convert that to a Timestamp when you're done.

Since you tagged this JavaScript, you could use a normal Date object to do the math:

const date = new Date(Date.now() - 60*60*1000)

The convert that to a Timestamp with Timestamp.fromDate() :

const timestamp = admin.firestore.Timestamp.fromDate(date)