If the format is just HH:MM you can simply use the normal string comparison, so a simple sort @dates should work.
but it does not work
That's not an error description.

One of the obvious problems is that here: 

    if ($h_a < $h_b){
        -1;
    }
    if ($h_a > $h_b){
        1;
    }

[download]

There should really be return statements. But all of this could be written rather compactly as $h_a <=> $h_b || $m_a <=> $m_b - but as I said before, for simple formats there's no need for that at all.

In reply to Re: sub routine to sort per time by moritz
in thread sub routine to sort per time by steph_bow

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