问在perl中，如何从通过文本文件传递并以dd-Month-YYYY(1-jan-1990)格式输出的日期中减去10天

EN

#!/usr/bin/perl

use strict;
use warnings;
use 5.010;

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

my $parser = DateTime::Format::Strptime->new(
  pattern => '%d-%B-%Y'
);

my $input = '25-jan-2013';

my $todate = $parser->parse_datetime($input);

my $fromdate = $todate->clone;
$fromdate->subtract(days => 10);
say 'From: ', $fromdate->strftime('%d-%B-%Y');
say 'To: ', $todate->strftime('%d-%B-%Y');

use warnings;
use strict;
use autodie;
use feature qw(say);

use Time::Piece;
use Time::Seconds;

my $date = "25-jan-2013";

#Create the "date object". The `%d-%b-%Y" is format the date is in
my $my_date = Time::Piece->strptime($date, "%d-%b-%Y");  #

#Now subtract ten days from it
$my_date -= ( 10 * ONE_DAY );  #Constant from Time::Seconds

say $my_date;   #Prints out Tue Jan 15 00:00:00 2013

#Printing it out in dd-mmm-yyyy format you had
say $my_date->mday . "-" . $my_date->monname . "-" . $my_date->year;

#!/usr/bin/perl
use warnings;
use strict;

use Date::Manip;

my $todate  = '25-jan-2013';
my $newdate = DateCalc(ParseDate($todate), ParseDateDelta('- 10 days'));

print "$newdate\n";