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#!perl
use strict;use warnings;
...
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";

>perl pad.pl
substr month= 1
substr day= 09
sprintf month= 01
sprintf day= 09