With the recent passing of a 'symmetrical date' (20:02 20/02 2002) and my inability to find any related posts on here, I present the following code from a co-member of a local linux users' group to produce a list of all symmetrical dates of the form HH:MM DD/MM YYYY

By symmetrical I mean either of the following examples: We are in Australia, so we put dates in the form DD/MM .. assuming we can start with (00:00 10/01 0000) and end with (19:59 21/12 9591) - the code below produces 8640 such dates.

I'm simply curious to see the results of a few rounds of golf on this problem. 
#!/usr/bin/perl -w
my %symmetrical = ();

my $time;
my $year;

my @months = ('1001', '2002', '3003', '0110', '1111', '2112');

foreach my $i (0 .. 2359)
 {
  $i = &fill($i);
  $i =~ m/(\d\d)(\d\d)/;
  if (($1 > 23) or ($2 > 59)) { next; }
  $time = $i;
  $year = reverse($i);
  $symmetrical{$year} = $time;
 }

for my $i (sort(keys %symmetrical))
 {
  my $ryear = $i;
  my $rtime = $symmetrical{$i};
  $rtime =~ s/(\d\d)(\d\d)/$1:$2/;
  for my $rmonth (@months)
   {
    $rmonth =~ s/(\d\d)(\d\d)/$1\/$2/;
    print "$rtime\t$rmonth\t$ryear\n";
   }
 }

sub fill
 {
  my $i = shift;
  while (length($i) < 4)
   {
    $i = '0' . $i;
   }
  return $i;
 }

[download]

In reply to Symmetrical Date Golf by ryan

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.