Magento - MongoDB Cache cleaner for https://github.com/colinmollenhour/Cm_Cache_Backend_Mongo

clean.php

<?php

$cfg = array(
    'server' =>     'mongodb://127.0.0.1:27017/?journal=false&w=1&wTimeoutMS=20000',
    'db' =>         'cm_cache',
    'collection' => 'cm_cache'
);

// set to timezone to UTC, like magento do this
date_default_timezone_set('UTC');

$conn = new MongoClient($cfg['server']);
$db = $conn->selectDB($cfg['db']);
$collection = $db->selectCollection($cfg['collection']);

// remove old cache
$collection->remove(array('e' => array('$lte' => new MongoDate())));
// Delete data older than 1 month
$time = strtotime('-1 month');
$collection->remove(array('m' => array('$lte' => new MongoDate($time))));

echo "complete";