How to perform date range queries in faunadb

I’m trying to perform a date range query to return all the records between 2 dates, but no matter what I try, it always returns zero results, even though I have the data existing in the collection.

My index was initially defined like this:

CreateIndex({
    name: "entries_by_date_only",
    source: Collection("Entries"),
    terms: [{ field: ["data", "created"] }]
})

This is a sample record from the Entries collection:

{
  "ref": Ref(Collection("Entries"), "36561645689871265"),
  "ts": 1684938186510000,
  "data": {
    "email": "[email protected]",
    "firstEntry": true,
    "state": "NY",
    "optin": true,
    "lang": "en",
    "created": "2023-08-22T10:23:06-05:00",
    "name": "Test Name",
    "ip": "123.123.456.456",
    "eligibility": true
  }
}

And this is the query I am trying:

const START_DATE = req.params.startDate; // I have tried 2023-08-01 AND 2023-08-01T00:00:00-05:00
const END_DATE = req.params.endDate; // I have tried: 2023-08-30 AND 2023-08-30T23:59:59-05:00

const entriesQuery = q.Map(
    q.Paginate(
        q.Range(q.Match(q.Index("allEntries")), START_DATE, END_DATE)
    ),
    q.Lambda("entry", q.Get(q.Var("entry")))
);

const entriesResult = await client.query(entriesQuery);

console.log("ENTRIES", entriesResult); // Logs: ENTRIES { data: [] }

Is there anything I’m missing here? The field holds the string in ISO format, so I thought I could use it for this purpose. Is that even possible?
Thanks in advance for any help.