in reply to sorting a hash by its values, date

The problem is that you can't sort a hash, you sort an array of, for instance, the keys of the hash. So replacing sort by_date %H with sort by_date keys %H should work.

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Re^2: sorting a hash by its values, date
by levbao (Initiate) on Aug 16, 2004 at 23:48 UTC
    Thank you so much for your answer. But the date is the values of the hash, not the keys of the hash.