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MongoDB ISODate not working

I'm facing trouble querying mongodb with date ranges. These dates are stored in the database using date type.

Collection::find(array("timestamp" => 'ISODate("2015-11-05T15:19:21+00:00")' ));
Collection:find(array("timestamp" => '2015-11-05T15:19:21+00:00' ));

These two queries return all 1000 documents spanning about a month, not just a day.

Collection::find(array("timestamp" => new MongoDate(strtotime(date('Y-m-d 00:00:00'))) ));

Again returning all month documents

Collection::find(array("timestamp" => ISODate("2015-11-05T15:19:21+00:00") ));

Call to undefined function ISODate

What do I do to accurately query documents for a day?

Hey, have you debugged your query to see the actual query send to mongodb?

Also check the examples in the docs here: https://docs.phalcon.io/en/latest/reference/odm.html#finding-documents

// All virtual robots ordered by name downward
$robots = Robots::find(
        "conditions" => array("type" => "virtual"),
        "sort"       => array("name" => -1)