Date::Calc - format the day and month

Question

All I am trying to do here is if the day or month is a single digit, to add a zero in the front of it. Right now it prints out the date as 201188, and I am looking for 20110808.

#!/usr/bin/perl
use Date::Calc qw(Add_Delta_Days); 
my (undef, undef, undef, $day, $month, $year) = localtime(); 
$year +=1900; 
$month +=1; 
($year, $month, $day ) = Add_Delta_Days($year, $month, $day, -3)
if ($month =~ /\d{1}/){
    s/$month/0$month/
}  
if ($day =~/\d{1}/){ 
    s/$day/0$day/
}
print $year,$month,$day; 

Answer 1

If you're happy to use Date::Calc, why not use DateTime ?

use DateTime;
my $date = DateTime->now;
$date->subtract(days => 3);
print $date->ymd;

In fact you can reduce that to:

print DateTime->now->subtract(days => 3)->ymd

Answer 2

Use printf instead:

printf "%d-%02d-%02d", $year, $month, $day;

Gives output such as:

C:\perl>perl -we "printf qq(%d-%02d-%02d), 2011,5,4"
2011-05-04
C:\perl>perl -we "printf qq(%d-%02d-%02d), 2011,5,12"
2011-05-12
C:\perl>perl -we "printf qq(%d-%02d-%02d), 2011,22,12"
2011-22-12