Perl script - add days to Date to get new date

Question

I am working on a perl script to add days to a date and display the newdate:

use Time::ParseDate;
use Time::CTime;

my $date = "02/01/2003";
my $numdays = 30;

my $time = parsedate($date);

# add $numdays worth of seconds
my $newtime = $time + ($numdays * 24 * 60 * 60);

my $newdate = strftime("%m/%d/%Y",localtime($newtime));

print "$newdate\n";

    The output will be:

    03/03/2003

Now how do I set the input for the date field to be yyyymmdd Ex: my $date = "20030102"

Also the output will need to be : 20030303

Thanks

Answer 1

You can use DateTime + DateTime::Format::Strptime:

#!/usr/bin/perl
use strict;

use DateTime;
use DateTime::Format::Strptime;

my $strp = DateTime::Format::Strptime->new(
    pattern => '%m/%d/%Y'
);

# convert date to 
my $date = '02/01/2003';
my $dt   = $strp->parse_datetime($date);
printf "%s -> %s\n", $date, $dt->add(days => 30)->strftime("%d/%m/%Y");

OUTPUT

02/01/2003 -> 03/03/2003

Answer 2

You use Time::Piece + Time::Seconds (in core since Perl 5.10),

use Time::Piece ();
use Time::Seconds;
my $date = '20030102';
my $numdays = 60; # 30 doesn't get us to march

my $dt = Time::Piece->strptime( $date, '%Y%m%d');
$dt += ONE_DAY * $numdays;
print $dt->strftime('%Y%m%d');