In the spirit of Tim Toady, when you have all the date/time elements in separate variables printf / sprintf can be your friend: 
use strict;
use warnings;
my $format = "%4u-%02u-%02u %02u-%02u-%02u";
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime;
printf "$format\n", $year+1900, $mon+1, $mday, $hour, $min, $sec;
my $event = 'The Eagle has landed (' . sprintf($format, 1969, 7, 20, 2
+0, 17, 40) . " UTC)\n";
print $event;
__END__

2013-10-13 10-49-01
The Eagle has landed (1969-07-20 20-17-40 UTC)

[download]

In reply to Re: Date format YYYY-MM-DD HH-MM-SS by keszler
in thread Date format YYYY-MM-DD HH-MM-SS by Rahul Gupta

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.