in reply to Undesirable parent hash keys
Also, unless at some future point you need to walk through and find only entries under a particular nested hash-key, you might consider creating a single string that consists of each of the parts, separated (say) by a vertical-bar character, e.g. 2013|Oct|11th|1AM, or some other useful-to-you variation on that theme.
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Seekers of Perl Wisdom