I have the following which I converted from C a long time ago when I was very new to Perl. It was set up for the UK so the Julian/Gregorian change is in 1752.

#   ------
sub isLeap
#   ------
{
    my $year = shift
       or croak "isleap(): no year supplied\n";
    croak "isLeap(): year not numeric\n"
       unless $year =~ /^\d+$/;
    return 0 if $year % 4;
    return 1 if $year < 1753;
    return 1 if $year % 100;
    return 1 unless $year % 400;
    return 0;
}

#   -------
sub valDate
#   -------
{
    my($year, $month, $day) = @_;
    return 0 unless
       $year =~ /^\d+$/
       and $month =~ /^\d+$/
       and $day =~ /^\d+$/;
    my $daysinm = [
       [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
       [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]];
    return 0 if $year < 1 or $year > 9999;
    return 0 if $month < 1 or $month > 12;
    return 0 if $day < 1 or
       $day > $daysinm->[isLeap($year)]->[$month - 1];
    return 0 if $year == 1752 and $month == 9 and
       ($day > 2 and $day < 14);
    return 1;
}

[download]

It works for any year from 1 to 9999 (not y10k compliant I'm afraid ;-)

I hope this is of use.

Cheers,

JohnGG

In reply to Re: Simple Date Validation by johngg
in thread Simple Date Validation by Trihedralguy

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.