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  1. PO
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    <p>I am going to one last time try to answer this as clearly as possible.</p> <p>First, if all timestamps are like <code>2008-08-07T22:31:06Z</code>, there is no need to map them through <code>UnixDate</code> as standard <code>sort</code> using <code>cmp</code> will sort them correctly.</p> <pre><code>#!/usr/bin/perl use strict; use warnings; use Data::Dumper; use Date::Manip; my %args = ( car_models =&gt; { a =&gt; { year =&gt; '2009-08-07T22:31:06Z' }, b =&gt; { year =&gt; '2008-08-07T23:31:06Z' }, c =&gt; { year =&gt; '2008-08-07T21:31:06Z' }, }, ); my @sorted_cmp = sort { $a-&gt;{year} cmp $b-&gt;{year} } values %{ $args{car_models}}; print "Sorted *without* using UnixDate:\n"; print Dumper \@sorted_cmp; my @sorted_dm = sort { UnixDate($a-&gt;{year}, '%o') &lt;=&gt; UnixDate($b-&gt;{year}, '%o') } values %{ $args{car_models}}; print "Sorted using UnixDate:\n"; print Dumper \@sorted_dm; </code></pre> <p>Output (after setting <code>TZ</code> in <code>cmd</code> to placate <a href="http://search.cpan.org/perldoc/Date::Manip" rel="nofollow noreferrer"><code>Date::Manip</code></a>):</p> <pre> C:\Temp> cars Sorted *without* using UnixDate: $VAR1 = [ { 'year' => '2008-08-07T21:31:06Z' }, { 'year' => '2008-08-07T23:31:06Z' }, { 'year' => '2009-08-07T22:31:06Z' } ]; Sorted using UnixDate: $VAR1 = [ { 'year' => '2008-08-07T21:31:06Z' }, { 'year' => '2008-08-07T23:31:06Z' }, { 'year' => '2009-08-07T22:31:06Z' } ]; </pre> <p><em>No warnings</em>, <em>no errors</em> ... <em>Ergo</em>, all you have put on this page is one big mess of a red herring. Besides, this still does not explain where the <code>1249998666</code> in <a href="https://stackoverflow.com/questions/1267706/perl-hash-ref-error">your other question</a> came from.</p>
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    1. POWhy do I get “uninitialized value” warnings when I use Date::Manip’s UnixDate in a sort block?
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    1. USCommunity
    1. USSinan Ünür
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    1. COH-ha, that's easy one. He put unix timestamps (product of UnixDate) into an array of supposedly hash references of automotive data and later he tried to operate them as if they are hash references: push(@not_sorted_models, UnixDate($_->{'year'},"%o")); hence the error Can't use string ("1249998666") as a HASH ref
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      1. USzakovyrya
    2. CO@zakovyrya precisely why I have been asking the OP to show the actual data structures and code he is using and trying to discourage others from going on a wild goose chase with the fragments he has posted in three separate questions so far.
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    3. CO@Sinan Ünür: Sometimes it adds to fun :) Isn't that what this site is all about?
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