Query firestore database on timestamp field

Question

I'm relatively new with firestore (and programming) and wasn't able to find a solution to my problem online.

Looking to query documents in an existing collection. The documents all have a timestamp field.

When I attempt to query for all documents ">" or "<" right now, the query works fine. When I attempt to query for ">" or "<" 7 days ago, the query returns nothing. I'm sure that I'm probably just missing something small. Thanks for any help!

These return documents as expected:

var today = new Date();
db.collection("****").where('display', '==', true).where('createdAt', '>', today).get().then(function(querySnapshot) {

and

var today = new Date();
db.collection("****").where('display', '==', true).where('createdAt', '<', today).get().then(function(querySnapshot) {

These don't return anything:

var today = new Date()-604800000;
db.collection("****").where('display', '==', true).where('createdAt', '>', today).get().then(function(querySnapshot) {

and

var today = new Date();
db.collection("****").where('display', '==', true).where('createdAt', '>', today-604800000).get().then(function(querySnapshot) {

and just for the heck of it

var today = new Date()-1;
db.collection("****").where('display', '==', true).where('createdAt', '>', today).get().then(function(querySnapshot) {

I've seen others request a look at what the field looks like in Firestore so here is a pic: sorry it's a link

Please let me know if there is anything else that might be helpful. Thanks!

EDIT TO SHOW NEXT ATTEMPT:

var config = {****};
firebase.initializeApp(config);

const db = firebase.firestore();
const settings = {/* your settings... */ timestampsInSnapshots: true};
db.settings(settings);

var today = new Date();
var yesterday = date.setDate(today.getDate() - 1);
db.collection("****")
    .where('display', '==', true)
    .where('createdAt', '>', yesterday)
    .get()
    .then(function(querySnapshot) {console.log(createdAt)});

Answer 1

Ok. So I got some assistance from a very helpful Google developer.

This ended up working.

var beginningDate = Date.now() - 604800000;
var beginningDateObject = new Date(beginningDate);

db.collection("****")
    .where('display', '==', true)
    .where('createdAt', '>', beginningDateObject)
    .get()
    .then(function(querySnapshot) {console.log(/* ... */)});