how to sort one coulmn on clicking another column header?

In my application i have one column containing values as date ranges like 01/02/2005 - 01/01/2007. i want to sort column based on the first value(ie., 01/02/2005).
how can i sort this?
my idea is having separate hidden column for first value and on clicking the 'range' column header i want to sort the table based on hidden column values.
is it possible?
March 22,

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