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use strict;
use warnings;
use Time::Local qw(timegm_posix);
# Seize The Day
#
sub mday_for_week_dow {
my ($year_num, $month, $week, $dow)= @_;
my $time = timegm_posix( 0, 0, 12, 1, $month, $year_num );
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst);
while (1) {
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)= gmtime($time);
last if $wday == $dow;
$time += (24 * 60 * 60);
}
for (;$week;$week--) {
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)= gmtime($time);
return 0 if $mon != $month;
$time += (24 * 60 * 60) * 7;
}
return $mday+1;
}
my @day_name= qw(Sun Mon Tue Wed Thu Fri Sat);
my @month_name= qw(Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec);
sub num_suffix {
my ($n)= @_;
return $n . ($n == 1 ? "st" : $n == 2 ? "nd" : $n == 3 ? "rd" : "th");
}
for my $tuple (
[2024, 4, 1, 2],
[2025, 10, 2, 4],
[2026, 8, 5, 3],
) {
my ($year, $month, $week, $dow)= @$tuple;
my $mday = mday_for_week_dow($year, $month-1, $week, $dow);
printf "The %s %s of %s %s %s\n",
num_suffix($week),
$day_name[$dow],
$year,
$month_name[$month-1],
$mday ? "is the ".num_suffix($mday) : "does not exist";
}
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