Get the newest and oldest date from a list - Ruby

I have an array of Ruby Dat开发者_开发百科e objects. How can I find the newest datetime and the oldest datetime?

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date_array.min # => Oldest
date_array.max # => Most recent

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oldest, newest =  date_array.minmax

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You have a comparison operator:

http://www.ruby-doc.org/core/classes/Date.html#M000673

Sort it.