I am using Firestore and I got a field with type of timestamp which record the timestamp when document was stored in the database, and it worked perfectly.
And I want to get the time different between that timestamp and current timestamp (now). How can i do that
This is the sample document I stored in the database 2020-12-11T03:01:31.674Z
As mentioned by Doug Stevenson in the comments, the field in your Firestore is a String, not a Timestamp, so you will have to convert it before you can be operated by your code. You could do something like this:
const doc = db.collection('posts').doc(id).get().then(function(doc) {
if (doc.exists) {
var data = doc.data();
var createdAt = (new Date(data.first).getTime());
var difference = Date.now() - createdAt;
//this will be in milliseconds
console.log(difference);
}
}).catch(function(error) {
console.log("Error getting document:", error);
});