In my DB so much old data is there. I want to remove which is older than 3 months(90 days). For that I came upto here.

#!/usr/bin/perl

use strict;
use warnings;
use MongoDB;

$db_host="xxx.xx.xx.xxx";  #Removed ip for security purposes
my $client     = MongoDB::MongoClient->new(host => $db_host, port => 2
+7017);
my $database   = $client->get_database( 'ravi' );
my $collection1 = $database->get_collection( 'collection' );
my $removed1 = $collection1->remove({'Date'=>{'$lt'=>"14-03-2015"}});
print "\n$removed1";
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here my problem is in my command if I write 14-03-2015 Its deleting second month & third month of year 2015 & 2104. But not 12 to 4 months of 2014 data. Suppose if i give 14-12-2014 like this it will remove total data of that collection. Means its considering only month but not year. Please show me a proper approach