#!/usr/bin/perl -CSDA

use utf8;
use Modern::Perl;
use Time::Piece;
use Time::Seconds;

my $reservation_date = localtime->strptime("2020-03-15#", "%Y-%m-%d#")
+;
print "$reservation_date\n";

my $one_year_from_now = $reservation_date->add_months(-12);

if ($reservation_date > $one_year_from_now) {
        printf "%s is after one year earlier from now that is %s\n",
                $reservation_date->strftime("%Y-%m-%d"),
                $one_year_from_now->strftime("%Y-%m-%d"),
}
 
my $one_week_from_now = localtime() + ONE_WEEK;

if ($reservation_date < $one_week_from_now) {
        printf "%s is before one week from now that is %s\n",        
                $reservation_date->strftime("%Y-%m-%d"),
                $one_week_from_now->strftime("%Y-%m-%d %H:%M:%S"),
}
[download]

result: 

Sun Mar 15 00:00:00 2020
2020-03-15 is after one year earlier from now that is 2019-03-15
2020-03-15 is before one week from now that is 2020-04-12 20:43:49
[download]