$ perl -MO=Deparse,-p
#!perl
use strict;use warnings;
use Time::localtime;
print "substr month= " . (substr("0" . localtime->mon() + 1, -2)) . "\n";
print "substr day= " . (substr("0" . localtime->mday(), -2)) . "\n";
print "sprintf month= " . (sprintf "%02d", localtime->mon() + 1) . "\n";
print "sprintf day= " . (sprintf "%02d", localtime->mday()) . "\n";
^D

##</code><code>##

use Time::localtime;
BEGIN {${^WARNING_BITS} = "UUUUUUUUUUUU"}
use strict 'refs';
print((('substr month= ' . substr((('0' . localtime()->mon) + 1), (-2))) . "\n")
);
print((('substr day= ' . substr(('0' . localtime()->mday), (-2))) . "\n"));
print((('sprintf month= ' . sprintf('%02d', (localtime()->mon + 1))) . "\n"));
print((('sprintf day= ' . sprintf('%02d', localtime()->mday)) . "\n"));