in reply to Sorting The Date format Values without using any perl modules.

If your dates are precisely in that format, i.e. YYYY-MM-DD, then a plain (string-wise) sort should just do: 
$ perl -le 'print for sort qw/2005-12-01 2005-11-02 2005-12-07/'
2005-11-02
2005-12-01
2005-12-07

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