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my %Hash;
$Hash{'2012'}{'Jan'}{'13th'} = 1; # set 13th Jan 2012 to true
...
  ## I only want to be here if I set
  ## $Hash{'2013'}{'Oct'}{'11th'} = 1 explicitly.
}

if ($Hash{'2013'} && $Hash{'2013'}{'Oct'} && $Hash{'2013'}{'Oct'}{'11t
+h'} && $Hash{'2013'}{'Oct'}{'11th'}{'1AM'} && $Hash{'2013'}{'Oct'}{'1
+1th'}{'1AM'}{'30Min'}) {
 # do something here
}