comment on

Just because I like to roll my own:

use strict;
use warnings;

while (<DATA>) {
    chomp; print "$_ : ", validate($_), "\n";
}

BEGIN {
    my @mdays = (0,31,28,31,30,31,30,31,31,30,31,30,31);
    sub validate {
        no warnings;
        my ($year, $month, $day) = $_[0] =~ m/^(\d{4})(\d{2})(\d{2})$/
+;
        my $nyear = (localtime())[5] + 1900;
        ##### Year range is 10 years on either side of current year
        ##### Also exits if m// returned nothing
        return if $year < $nyear - 10 || $year > $nyear + 10;
        return if $month < 1 || $month > 12;
        ##### Leap year conditions
        if ($month == 2) {
            if ($year % 4 != 0) { $mdays[2] = 28; }
            elsif ($year % 400 == 0) { $mdays[2] = 29; }
            elsif ($year % 100 == 0) { $mdays[2] = 28; }
            else { $mdays[2] = 29; }
        }
        return if $day < 1 || $day > $mdays[$month];
        return 1;
    }
}

__DATA__
1234567
19991203
20051303
20051232
20040229
20050229
20401223
[download]

In reply to Re: checking for valid date by TedPride
in thread checking for valid date by alandev

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