Determine if a date is prior to another date/year - include as criterion

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I would like to determine if a date is prior to 01/01/2015 and include it as criterion for the count/distinct/collect combination I inquired about previously??

=COUNT(DISTINCT(COLLECT({CIP Detail Summary Range 4}, {CIP Detail Summary Range 5}, ="OPEN", {CIP Detail Summary Range 3}, =0, IF(YEAR({CIP Detail Summary Range 1} < 2015)))))

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