Take another look at variable declaration. You $MM is local, but the otehrs are global. You want:

my ( $MM, $DD, $YY, $YYYY );

[download]

If you don't assign anything to them, they wind up undef, which is the same value you explicitly assign to them.

The first two date formats differ only in zero-padding the day. Both will use the same split code, the only difference will be the precise return value. Similarly, the slash-delimited formats differ only in the segment of the hash used in looking up the corresponding month; otherwise they are identical.

Now if you want a REAL challenge, figure out how to differentiate between US, English and European formats:

--
TTTATCGGTCGTTATATAGATGTTTGCA

In reply to Re: More Date Conversion Happiness, Part 2 by TomDLux
in thread More Date Conversion Happiness, Part 2 by ctp

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.