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#!/usr/bin/perl

use strict; 
use warnings;

use 5.010;
use POSIX;
use Time::localtime ();

my %config = ( logfilename => 'ox.log' );
my $dayfolder = $config{logfilename}."\\".POSIX::strftime("%Y-%m-%d", localtime);
print $dayfolder;

https://metacpan.org/pod/Time::localtime#DESCRIPTION

To access this functionality without the core overrides, pass the use an empty import list, and then access function functions with their full qualified names. On the other hand, the built-ins are still available via the CORE:: pseudo-package.